4 In. welded square box. 1-1/2 In. deep with NMSC clamps, (5) 1/2 In. & (2) 1/2 In. to 3/4 In. TKO knockouts, MS bracket, flush. Features welded steel construction with MS BOX-LOC bracket that can position box on either side of a stud and nonmetallic sheathed cable clamps. Easy to install, simply place the bracket on the open side of the stud first. Slots in the bracket engage the lip of the stud. Provided with far-side support. TKO knockouts allows for design and installation flexibility. 21.0 Cu. In. capacity. Acceptable for use in 2-hour fire rated walls.