ERGOTRON 60-591-003 Steel Stud Wall Mounting Kit, Screw size = 1/4-20 x 1-1/2", Capacity up to 50 lbs, Strong, aluminum plate construction, Includes Wall Plate, six (6) screws, six (6) anchors, SILVER Fastener kit and the wall plate that securely attaches Ergotron wall mounts to steel-stud constructed walls.