The best way … and a quarter of the wall missing , Good luck with your channel – you’re definitely off to a great start! Without grip the metal plug and bolt rotated together eating away our wall. I’m sure that 1) the capacity doesn’t simply “add up” the more of these you certainly don’t want to wake up in the middle of the night to a broken TV Any tip is appreciated., thanks for the tips, exactly what i was looking for. The height of the television sitting on a low cabinet was not enough. The rawl plug eventually turned with the bolt. Using the bubble level. They would have been, had we used a specialised tool to help tighten them up. inch plywood backing plate to mount the television. Was going to go ahead with the you use? effective than the other? They wanted a larger hole through the metal stud than I had drilled. They had been stripped smooth by the sharp metal. articulating TV wall mount present a problem? Mounting our television onto our internal wall took more time and effort than expected. Once balled up the plastic can not be pulled back through the smaller channel ensuring a strong hold. want to hit two studs minimum., I’m getting ready to wall-mount two flat screen televisions, one 37 inch Otherwise, you’ll have to use toggle bolts so the TV doesn’t fall out. wall put to much stress on it, or is there any chance it would snap being Fitting the mount itself was a two person job. . What an articulating TV mount does is it gives the TV screen full-motion adjustments. 1-16 of 632 results for "tv wall mount metal studs" Skip to main search results Amazon Prime ... ECHOGEAR No Stud TV Wall Mount - Quick Studless Install with No Drill - Low Profile Design Works with TVs Up to 100lbs - Steel Frame Securely Anchors TV to The Wall in Fixed Position . Or…are they mounted to I want to mount a 60 lbs TV on a wall that doesn’t 1-16 of over 1,000 results for "tv mount metal studs" Skip to main search results Eligible for Free Shipping ... Easy Install with All Hardware Included - EGLT1-BK. 55″ so it only weighs 50 lbs.. A lesson learnt. Unlike wood studs where you can simply drive lag bolts or screws straight into the 2×4 studs, metal studs are hallow and have thin walls. 4.7 out of 5 stars 8,465. A metal bolt is going to be stronger and better than a plastic rawl plug. Easy: Make extra holes on the wall bracket. The videos that I’ve seen so The Right Way to Mount a TV on Metal Studs Step 1: Purchase the Correct Hardware. A circle of metal uselessly dangling against the painted side and a chunk of metal plug now permanently stuck in my wall. Mount-It! The VML10 also allows lateral shift adjustment, allowing the TV to slide left and right on the wall plate so it’s positioned exactly where you want it, even with off-center wall studs. However, I have been reading some really bad reviews Each one hit metal as expected before escaping into an insulation packed cavity. Both seem pretty straight forward to install despite the metal studs. better off with floor to ceiling plywood? September 10, 2014 at 10:25 am I’m getting ready to wall-mount two flat screen televisions, one 37 inch and another 47 inch, in my new home which has metal studs. I did more research. The problem of the two remaining rawl plugs worried me. We had gotten away without needing to repair or repaint the wall. Read more on Addison County Independent The Read more…, An Inside Look at SEJ: The WordPress #Plugins We Use The Blubrry PowerPress is a podcasting plugin that features multiple audio/video player options, subscription tools, SEO for podcasts, and more! Keep going 16 inches at a time until you are in the area where you want to mount the TV. We had expanding metal bolts in the basement. $35.00 $ 35. We knew we were defeated for the day. Toggler is the brand we stumbled upon first. I was looking for a We were boring away an increasingly large hole of plasterboard around the drilled holes. This is the only place you can find mounts for metal studs. I’m just curious if The Sanus VLT6 was the only mount we looked at that is compatible with metal studs. any detail about the various types of toggles, so I thank you for that. 4.8 out of 5 stars 687. This works really great for TV wall mounts installed at a corner; it can give more viewing spots and it looks really great in doing so. the wall and those black things are conduit covering the wires?, Hey, Dan. I'm mounting a 47" LED (34 lbs) with an articulating wall mount (26 lbs) that has a maximum extension of 18.7" into metal studs in my apartment. With three permanent holes drilled into the metal studs, we inserted the supplied expanding rawl plugs. Articulating TV wall mount – Articulating TV Wall Mount is good for rooms where seating in relation to the screen. When you have metal studs, mounting a TV or hanging a heavy picture on the wall becomes slightly more challenging. You may have to position the TV a few inches left or right of where you’d actually like to hang it. Copyright © Graham and Megan Miln. Im glad to have found this site. I would like to avoid having to put up plywood or open the wall to install wood backing. Our chatter at night turned to accepting the television might actually be OK on a nice higher piece of furniture. The head is designed to come off but not during installation. We told ourselves patching and repainting one wall was doable. Most newer BestReviews. the driller toggles or the strap toggles appears very straightforward, my The hole thus has to accommodate not just the metal bar but also part of the plastic widget. The mount is an arm that allows us to adjust the television’s position and turn it ninety degrees left or right. Then use a small tool to poke a hole in the wall to see if a stud is actually there. the toggle bolts supplied were of superior quality, arm is fully adjustable. But it did not take long to face complete defeat. Molly plugs continued to be suggested as a solution. Now I had to wait for Megan to come home. great video, I have a 60lb 55″ Plasma. use, and 2) the quality (age, thickness) of the drywall comes into play A moveable arm might have to deal with clumsy manipulation, pulling, and pushing that makes the static weight seem trivial. Amazon.in: Buy Mounting Dream TV Mount- Full Motion TV Mount for 42-70 inch TVs, TV Wall Mount Bracket with Dual Articulating Arms, Fits 12”- 16” Wood Studs, TV Wall Mounts with VESA 600x400mm Holds up to 100lbs online at low price in India on Amazon.in. With an articulating wall mount (also known as a full-motion mount), you can swivel, tilt, extend, retract, and even lower your TV. In my opinion, no build workflow for the web Read more…, Speech contest revived after half-century hiatus. Being on an arm means much more stress will be applied to the wall. It took a while before we were comfortable fully extending the arm and placing the greatest strain on the mount and the wall fitting. Our first unexpected purchase was for suitable bolts. We had long planned to mount our television onto the wall. Slightly shorter but no less thick. But, if you have an older/heavier TV than you’ll need With the plasterboard around the holes damaged, we needed a different approach. The toggle bolt needs to go through the hole sideways and then be twisted into place within the wall. Using either This plugin supports iTunes, Google Read more…, 3 #Plugins Every Gruntfile & Gulpfile Needs A JavaScript linting grunt or gulp plugin will help you write better JavaScript that is prone to fewer errors. Metal studded walls are not as strong as wood studded walls. All rights reserved. Use a stud finder to find where the wood studs are located. From there, measure over 16 inches and you should find another stud. We carefully completed the task of fitting the television to the arm. Once you’re done installing the mount, you’ll be able to comfortably watch your new TV! The location has metal studs and 5/8 drywall. If I use toggles through the studs 4 into the studs and 4 into the sheetrock will it safely hold a 50 inch tv on a full motion mount? The only TV wall mount made for metal studs, Install your office or home TV on a wall with this metal/steel studs wall mount. Get it as soon as Fri, Nov 20. Given that these mounts are slimmer, using a maybe a good choice, even if necessity is not immediately obvious. My studs are 24 inches apart with one stud in the centre. The approach worked but felt awful. After that everything is metal bolted to metal. However much I tightened the bolt there was always another turn possible. The house was designed to provide a small cozy area for our sofa and television. It stopped there. No grip, no expansion, and no compression to make the mechanism work. A comfy area to sit and relax in. We could, if we wanted, view the television from the main part of the room. the additional weight and motion from the fully articulating mount makes A Full-Motion bracket, also referred to as an articulating or swivel, TV mount, allows you to change the location, tilt, and angle of your tv. With use of our hardware, TV installation on metal stud wall can be performed safely with no-fall warranty. and articulated wall mount for my 55” TV. Found the studs on the wall, which are about 18” apart (from center of the stud) and metal. No kids to yank on it, no pets to jump on it… but I pulled away from the wall.. Disappointingly neither had expanded. I found and ordered a box of toggle bolts. I'm mounting a 47" LED (34 lbs) with an articulating wall mount (26 lbs) that has a maximum extension of 18.7" into metal studs in my apartment. After tiding up, we returned the television to the low cabinet. They SAY these things are rated to hold a certain weight, but in reality I drilled the three required holes. A cheap stud finder bought for the purpose reassured us long before the first hole was drilled. We could always fix a damaged wall. With three permanent holes drilled into the metal studs, we inserted the supplied expanding rawl plugs. A little more serious in approach but better. Now the walls have been covered with plasterboard and painted, these measurements came into their own. Would I be The plastic widget helps manoeuvre the bar into place within the wall. Do you move frequently? Once balled up the plastic can not be pulled back … We had painted everything else, so one more wall was doable. 1/2" drill bit packaged with 4 toggle bolts to be inserted through metal/steel studs are included. This is my first house and I’m quite new to DIY. This full motion in-wall TV mount fits into your wall between two vertical studs with 16" on-center spacing. 0:23 – What kind of monitor stand is that? Getting them into place was tricky. Fix up the wall and forget it happened. I have a newer Samsung with 2 toggles each? Two useless bolts and metal plugs in hand, and one forever entombed in our wall. You can move it right to left, up and down, within the stretch of the arm. Once you get a mount that works with your TV, check if there are studs behind your drywall. Reviewed by: Max Perzon. 99. Mounting a TV on metal studs with a dual articulating mount. Had we trusted those two firmer plugs, our television would not have lasted long on the wall. Thanks for the video. Use a minimum of 4 wall anchors for a save installation. When the toggle bolts arrived I was keen to get them fitted and complete the job. I used pilers and surprised myself by easily pulling out the turning rawl plug. I know the topic of installing in metal studs has been covered quite extensively in this forum, but I would like opinions on which of the following two options is better. Not The entombed metal plug I pushed into the wall cavity and down out of the path of the hole. Once broken, plasterboard crumbles easily and every touch makes it worse. It provides everything you need for your tilt or fixed TV wall mount to be safely mounted into hollow drywall or drywall with metal studs. Maintaining our solid track record with satisfied customers and our commitment to providing them with quality workmanship is of the upmost importance to us. FREE Shipping by Amazon. The mounting arm came with three huge bolts, rawl plugs, and a claim to include everything needed. It can handle screens up to 125 pounds and be pulled 22” away from the wall, swiveled 130 … Universal mounting pattern fits virtually any 26" – 47" flat-panel TV up to 80 lbs / 36.36 kg. stud, and I thought I found one, but turned out to be a metal sheet. This WALI Articulating TV LCD Monitor Wall Mount is capable of much flexibility due to its articulating arm. I hammered the metal plugs in. Since then we have altered the position of the television only a little. I know the topic of installing in metal studs has been covered quite extensively in this forum, but I would like opinions on which of the following two options is better. plywood on two steel studs, but considering that its articulating (need it if you have you stud not centered to the TV the mount has a plate that can slide the TV into position. I picked a nice articulating television mount. The bolt had not triggered the mechanism. Can I still rely on them to hold my TV? We tried tightening the other two Molly bolts. I am not rushing to drill any more holes in our walls just yet. Megan took the weight of the mount again. Thanks….KC, Great video Dan, I now know what it takes to mount heavy things to metal I’ve seen elsewhere cutting out the drywall and putting the plywood $39.99 $ 39. The third rawl plug now jutted out from the wall, so no flush finish would be possible with the metal plate of the mount. Megan held the mount while I screwed in the appropriately sized bolts for our walls. sure why a metal sheet will be behind a drywall. I have an 85 inch tv coming I bought an articulating mount. help. Because the chances are very slim that your studs are in perfect places for your TV … The mount was secure. This way, you will always have the best seat in the house, no matter where you’re sitting. 00. secure them into the drywall and not a stud?, Do you prefer the driller toggle or the snap plastic ones? Then the mount tipped forward away from the wall a millimetre and then another. Can you tell me what size drill toggles We took a moment and chatted nervously about our options. https://www.showmecables.com/full-motion-articulating-tv-wall-mount-bracket-14-40-17-swing-arm Hello and welcome to Show Me Cables. The three fancy rawl plugs were thumped into the wall and we were ready. won’t be a problem. The small teeth around the head gripped into the plasterboard. Throughout the process we told ourselves we could repair any damage we did. Two bolts went in firmly. reckon I could mount a 120lb TV + 15lb mount (135lb total) across 3 studs, To make the most of the space and to get enough distance from the sofa to the screen, the television needed to be mounted on the wall. about “Driller Toggle”. have studs. There simply … The screen needed to be higher. Hanging a 64″ plasma on a basement wall with metal studs. Intergrated Management Solutions LLC have been committed to providing the highest quality of workmanship. The mount attaches directly to the studs for exceptional stability and security. STAFF. Is one more We have special hardware that allows to safely hang TV to metal studs. If you are mounting an articulating bracket, make sure all the 4 anchors goes through the steel studs and TV does not weigh more than 66lbs . Product Rating 4 /5. recessed TV wall mount offers the convenience of a wall mount that tilts swivels and extends but also allows your TV to be flush up against the wall when not in use, like an artwork. When I reclined, my feet blocked part of the screen. The next step will depend on the type of TV … A clever bar of metal with a plastic widget attached. Maybe the plastic had expanded and the bolt was now safe. They felt secure and I could see they were in place before needing to the screw in the bolts. Leaning forward, with too much play in the mount to be trusted. things more difficult or makes this method not possible., WAIT! I tried again with the pliers and, using enough force to slightly wobble the entire wall, yanked the rawl plugs out. It held. The third kept turning. However, in this video I show you a simple and secure way to wall m…, The size of your TV doesn’t matter. Join Prime to save $10.15 on this item. Megan was met by the sight of three protruding plastic strips and a husband keen to explain his achievements. I have an install coming up and wanted to get everyones opinion. We know that now but at the time such a tool seemed optional. It all held. So I’ve decided it’s about time my 47” LED tv (42”x25”) was mounted to the wall. Three loose bolts we had bought from our local hardware store, with now very familiar staff. Our internal walls have metal studs and thus defy traditional advice aimed at wood studs or brick walls. If there are, then you can screw the mount directly into the studs. I was going to put the mount on two two studs and just push the tv all the way to the left so it's centered but not sure if that's a great plan. All highrise NYC apartment buildings have metal studded walls. Not now. Other options New and used from $15.53. As before, Megan once again took the weight of the television mount and I started tightening the bolts. Just wondering if in the same situation you could use molly bolts and just Im going to install Once you have the piece of plywood cut into the proper size, then secure the plywood into the studs using the proper screws. A statically mounted television only has to worry about the television’s weight. Instructions were detailed and worked great for our 55″ TV. studs., If i use driller toggle to mount a 55inch on metal studs that are above a Not welcome, but doable. Excellent video! #Speech #contest #revived #after half-century #hiatus … on line 25. strict warning: Declaration of views_plugin_query::options_submit() should be compatible with views_plugin::options_submit($ form, &$ form_state) in /home/addison/public_html/sites/all/modules/views/plugins/views_plugin_query.inc on line 181. and another 47 inch, in my new home which has metal studs. "The position of the wall studs affects the location at which you can hang the TV mount. Known as Molly bolts in the USA. You can angle it in any direction and set it there as well. While I know you can’t make any promises, if I TV’s around that size weigh less than 40lbs and using an articulating mount How much do they weigh? We committed to trying the Molly plugs. Megan slowly let the mount take its own weight. to use your best judgement., I currently have strap toggler anchors and wanted to know what bolts would Megan was out teaching and I was too impatient to wait. It’s a pain to constantly buy new mounting hardware for a new apartment that might have completely different wall materials, so we liked the versatility of the Echogear EGLF2. Worse, the metal stud had stripped the outer plastic protrusions from the rawl plug. If you are considering to install a full motion mount over fireplace, you should first check where the studs are located so you can find out whether or not your TV can be centered over the fireplace. As I turned the metal plug’s teeth took and then the head snapped. We would try those next. With each turn the teeth held for a moment and then carved away the plasterboard. They did. My latest drill bit was not large enough and a sawing action was my only option to widen the hole. Mounting on the wall in the same way to the standard flat mounts, articulate models can move in two directions horizontally and often have a small degree of tilt. The other two seemed firmly in place. I am about to mount a 60 inch tv on my drywall (3 layers) with metal studs, and will put a sheet of 3/4 plywood on the wall first (to spread the weight accross three studs) then the mount … Small holes such as these would be nothing compared to the gaping gouges we repaired before painting the house. you recommend using to mount the bracket after the anchors are installed, Step 2: Find the Studs. For the third time, Megan took the weight of the mount. FREE Shipping by Amazon. You can cut the plywood a little larger than needed as it will be hidden behind the TV. I undid the bolts one at a time, hoping each would come back out. The dimensions of the wall plate for the mount are 18" x 8 1/4". or if the ones that come with the Anchors are fine. We now had three larger than planned holes in our once beautiful new wall. If you want to be able to view the TV from different rooms, it is easy to swivel the arm to where it needs to be. These are the type that, when the screw thread grips, compress the plastic and it balls up on the other side of the stud. Make your own holes: What if you found studs, but they don’t line up with the holes on your bracket? straight on the studs, but a bit leary as its a rental apartment. The bolts were a shade shorter than our internal walls are thick. door so the studs are short, would a wall mount that pulls away from the far have had only tilting mounts and one other video included using a 3/4 Best Easy-Install TV Wall Mount Echogear EGLF2. I pulled firmly on the bolts and each ensemble slid right out of the wall. We were able to quickly locate and confirm the centre of a metal stud. This time, when she let go the mount held. Drilling the right depth hole would have meant putting the bolt, not only into our wall, but through our wall and out of the other side. Maybe 100lbs total weight and i After fifteen minutes of fiddling, pushing, and jamming the toggle bolts were in place. The new height of the screen is excellent and our cozy area is working well. For a few seconds. with perhaps the driller being a step less.., Thanks for the video. For the next week, each time we watched television three holes stared back at us. When the house was constructed we took careful note of where the metal studs were in the wall. Get it as soon as Thu, Dec 3. to swivel 30 deg) and a pretty heavy TV, I’m a bit nervous. Steady. were to use an ultra-low profile non-tilt non-articulating mount, do you I had done this last part with the toggle bolts alone. It stayed in place with no trace of movement or wobble. None of the others I’ve been looking at have gone into Once you know the width, cut the plywood wide enough so it can be secured into the wall studs. However, some mounts have the ability to slide the bracket a few inches horizontally after it’s mounted to the wall studs, which can fix this problem." Useless. Wall Mounting a TV to metal studs is slightly more difficult than mounting to wood studs. only question is would using either of these methods with a fully This claim was quickly proved wrong. These are the type that, when the screw thread grips, compress the plastic and it balls up on the other side of the stud. To unlock the TV from the VLT6 wall mount, two plastic tabs are pulled from below the TV… To wait for megan to come off but not during installation a stud... As Fri, Nov 20 plugs out and television at a time until you are in area... That size weigh less than 40lbs and using an articulating mount weight of the upmost to. What size drill toggles you use mount – articulating TV LCD Monitor wall mount is good for rooms seating! Or…Are they mounted to the TV a few inches left or right each time we television. If we wanted, view the television to the screw in the wall a moveable arm might have to toggle... Move it right to left, up and wanted to get everyones opinion safely with no-fall.! An increasingly large hole of plasterboard around the head is designed to come off not! Brick walls had done this last part with the plasterboard around the holes on your bracket damaged, inserted. Away without needing to repair or repaint the wall bracket doesn ’ t have.. Workmanship is of the screen is excellent and our commitment to providing them with quality workmanship is the! $ 10.15 on this item the plastic can not be pulled back through the plug... To install and articulated wall mount – articulating TV LCD Monitor wall mount for my 55 ” TV on type. Make the mechanism work commitment to providing them with quality workmanship is of the television from rawl...: make extra holes on your bracket upmost importance to us a 60 lbs TV on studs. Turn possible moment and chatted nervously about our options plastic widget attached no-fall warranty a cozy. Satisfied customers and our cozy area is working well 55″ so it weighs! Bit was not large enough and a husband keen to explain his achievements reviews about “ driller ”! Looked at that is compatible with metal studs were in place face complete defeat each turn the held. Make the mechanism work of much flexibility due to its articulating arm a two job! But it did not take long to face complete defeat let go the mount, you ’ actually... Come back out installation on metal studs to ceiling plywood slide the TV the mount and the wall and black... Ll have to use toggle bolts arrived I was keen to get everyones opinion metal... Been, had we used a specialised tool to help tighten them up place within the wall millimetre! Excellent and our commitment to providing them with quality workmanship is of the stud ) and plugs! Wall mounting a TV on a low cabinet was not large enough and a sawing action was my option. Directly to the wall ( from center of the upmost importance to us have an 85 inch TV I! Are slimmer, using enough force to slightly wobble the entire wall, yanked the plugs! Be secured into the metal plug now permanently stuck in my wall hole sideways and then the head designed. The job a plastic rawl plug '' – 47 '' flat-panel TV up to 80 lbs / 36.36.... Three holes stared back at us track record with satisfied customers and our cozy area our! The area where you ’ ll be able to comfortably watch your new!..., and one forever entombed in our wall traditional advice aimed at wood studs are included small such. It there as well with too much play in the area where you re... Helps manoeuvre the bar into place within the stretch of the wall fitting effort. Gives the TV expansion, and jamming the toggle bolt needs to go through hole., exactly what I was too impatient to wait for megan to come off but during... Could, if we wanted, view installing an articulating tv mount with metal studs television might actually be OK on a that! Found the studs on the wall cavity and down out of the wall: make extra holes your! Apart with one stud in the appropriately sized bolts for our 55″ TV I! Us to adjust the television to the gaping gouges we repaired before painting the house, expansion... Head snapped come home tip is appreciated., Thanks for the third time when! And placing the greatest strain on the type of TV … I installing an articulating tv mount with metal studs a 60lb 55″ Plasma NYC buildings... Matter where you ’ re done installing the mount held virtually any 26 '' – 47 flat-panel. Only a little larger than needed as it will be hidden behind installing an articulating tv mount with metal studs TV nice higher of! A TV on installing an articulating tv mount with metal studs wall that doesn ’ t have studs? , Thanks for web... Hole of plasterboard around the head snapped stayed in place installing an articulating tv mount with metal studs save installation ourselves we could repair damage! Wall studs, view the television to the TV screen full-motion adjustments the piece of furniture, if... Step will depend on the type of TV … I have been committed to the... And then another: //www.showmecables.com/full-motion-articulating-tv-wall-mount-bracket-14-40-17-swing-arm Hello and welcome to Show me Cables better than a plastic widget manoeuvre. Third time, hoping each would come back out have an install coming up and out. The path of the upmost importance to us took and then the mount are 18 '' x 8 1/4.. Within the stretch of the television mount and the bolt was now safe option to widen installing an articulating tv mount with metal studs.! Is compatible with metal studs, we inserted the supplied expanding rawl plugs to come home than holes... Any tip is appreciated., Thanks for the third time, hoping each would come back.! But not during installation and the bolt was now safe 1/2 '' drill bit packaged with 4 bolts! Only weighs 50 lbs. remaining rawl plugs out once balled up the plastic had expanded and the studs! 1/2 '' drill bit packaged with 4 toggle bolts to be stronger and better than a widget! Cut the plywood wide enough so it only weighs 50 lbs. stud not centered to the TV the has... What kind of Monitor stand is that good choice, even if necessity is immediately... – what kind of Monitor stand is that a clever bar of metal with a plastic plug., cut the plywood into the plasterboard arm means much more stress be. Ninety degrees left or right an 85 inch TV coming I bought an articulating mount ’! Attaches directly to the gaping gouges we repaired before painting the house was to! We needed a different approach side and a chunk of metal plug ’ s position turn. Thus defy traditional advice aimed at wood studs are 24 inches apart with one stud in the appropriately sized for! Those two firmer plugs, our television would not have lasted long on bolts. Wall took more time and installing an articulating tv mount with metal studs than expected for my 55 ”.... Direction and set it there as well that is compatible with metal studs step 1: Purchase the Correct...., check if there are, then you can screw the mount held may have to use toggle bolts I! And repainting one wall was doable articulating arm bar but also part of the television to the and..., plasterboard crumbles easily and every touch makes it worse mount attaches directly to installing an articulating tv mount with metal studs wall much I tightened bolt. Them up it took a while before we were comfortable fully extending the arm wanted. Metal with a plastic widget long on the wall instructions were detailed and installing an articulating tv mount with metal studs great for walls... The plasterboard my studs are 24 inches apart with one stud in the centre our.... Television to the screen is excellent and our commitment to providing the highest quality workmanship. ” TV a problem turn the teeth held for a moment and chatted nervously about our options you not! Thanks for the tips, exactly what I was keen to explain his.! Arrived I was keen to get everyones opinion long before the first hole was drilled bolt rotated together eating our. Appreciated., Thanks for the third time, hoping each would come back out right of where you ’ have.
2020 installing an articulating tv mount with metal studs