Four cable knockouts (ends). One 1/2" conduit knockout (bottom). With clamps for non-metallic sheathed cable. "S" backset. Mounting guides set 3/8", with bumps. Angle nail type. 3" x 2" x 2-27/32" deep, 15.8 cubic inch capacity. Prepositioned mounting nails included. Acceptable for use in 2-hour rated walls. UL Listed.