Octagon boxes are manufactured from durable pre-galvanized steel and are designed to house and protect electrical wiring, switches, receptacles and to support light fixtures. All steel octagon boxes are UL listed and acceptable for use in 2-hour fire rated walls and ceilings. 8-32 fixture mounting screws are assembled. 1-1/2 in. DeepDrawn with Conduit KO's, Raised GroundRACO® Octagon Boxes are used in the installation of ceiling or wall lighting fixtures15.5 cubic inches1-1/2" deepFour 1/2" side knockouts and five 1/2" bottom knockouts