Four cable knockouts (end). One 1/2" conduit knockout (bottom). Clamp screws through beveled corners. With clamps for non-metallic sheathed cable. Adjustable plaster ears allow box to be used in old work applications. Old work clips on side of box eliminates the need for additional box supports to secure box in wall opening. 3" x 2" x 2-1/4" deep. 10.5 cubic inches.