RACO’s 290 model 31/2-in. electrical box mounts fixtures to ceilings or walls. It is 1/2-in. deep and can be used on 1/2-in. or 5/8-in. drywall without stud mounting. After cutting the proper size hole, users insert the bracket and tighten the screw to secure in place. The zinc-plated steel construction provides a 2-hour fire rating.