4" 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. Raised ground screw. Volta VMB-30196

VMB-30196 - Deep Square Steel Stud Junction Box With Knockouts (52171-KSSX)