4x4x2-1/8 square box. Steel, 4" x 4" x 2-1/8" D., 30.3 cu. in. Side mounted FA bracket with back-up flange, set back 5/8". For metal or wood studs. (6) 3/4" knockouts on sides, (3) 1/2" and (2) 3/4" knockouts on bottom. 2 gang. UL listed. Material: Steel, Size: 4", Conduit Size: 1/2" & 3/4", Depth: 2-1/8", Volume: 30.3 cu in, Finish: Galvanized, UL Listed?: Yes