4 inches square box 4 inches height x 4 inches width x 2-1/8 inches depth 30 cubic inches. Concentric knockouts (1/2 and 3/4 inch), mounting strap for steel stud installations and integral additional support bracket. Recessed 1 inch. Raised ground screw. 52171-KSSX1 4" SQUARE DEEP BOX 3/4 1/2 KO