Southwire MSBMMT3G 3 Gang Multi Mount Device Box with Depth Adjustable; Heavy Duty 42lb; Gray

Good box. durable and solid

Heavy duty

It is a little hard to break the tabs at back where wire slides in. if you use the separator for non-voltage cables on one side of the box, be prepared to have to widen the opening somehow to let HDMI go through. The fact that you can screw it to the stud makes up for the inconvenience. Make sure to line up properly before screwing into the stud otherwise it will be slanted at the opposite side, not leaving a nice flush look after you put cover

Very good 3 gang box. Lot's of ways to install it depending on your needs. I installed between two steel studs for a set of bathroom switches.

I really recommend having several of these on hand for those jobs where you're not quite sure what you're going to be dealing with. The ability to utilize these boxes for multiple mounting configurations is terrific, especially for custom applications where special brackets or metal frames are being used. For our custom fabrication for animatronics and various special FX lighting, these are wonderful for fitting into unique applications.

Words cannot express my love for these boxes. I never purchase anything else now. It took me forever to understand how the clamps worked, but wow those things really hold the wires. I can't go back to the other "clamps" from most electrical boxes. I ended up using a shorter screw for one install, but otherwise these are perfect. They're so much easier to install and they don't budge afterwards. If you mess up, they're also pretty easy to remove.

I've never seen a PVC Electrical Box which was adjustable, and neither is this one. The top and side tabs might appear to be adjustable, as they seem to sit in shallow channels, but alas they are permanently attached. The nailing strip also appears to be adjustable, and if you take off the screws, the inside nailing strip does move back and forth about a quarter of an inch. But if you do move it, you will have to drill new holes I prefer a metal "old work" handy box which is fully adjustable to 3/4" with both top and side flanges and gangs together. This box is useless if you primary intention is to adjust beyond the 1/2" set back of the top and bottom tabs.

These boxes are super easy to install, new work attachment without making a new work sized hole in existing construction. No running screws through the side of a standard box and hoping the inspector is cool with it. Deep and roomy. Wish I could get these local, worth the wait to ship.

Needed this to upgrade a wall outlet to a triple. Very easy to install. Happy with this product.

No Internal Ground mounting/ lock, the standard is applied on every Outlet box except for this product

This is a spectacular box to work with. It’s deep and very solid. I had no problems installing it to a stud inside the wall and wired a box with five different lines coming into it. The only negative I have is that it is tricky to sometimes feed the wires in and out of it. Besides that… I have no clue why this box is not sold everywhere. It’s a great deal.