4 Round Ceiling Box with two captive mounting nails and four Auto/Clamps.It is constructed of impact-resisitant Noryl thermoplastic, making it virtually unbreakable and non-conductive. Its depth-mounting gauge at bottom of bracket helps you align the box at the proper depth relative to the ceiling.50 pack.
22.5 Cu. In. 4" dia. round fixture support box for use with nonmetallic sheathed cable - Machine tapped fixture holes, rigid hard box construction, no distortion with high temperatures, shatter resistant with low temperatures - New work residential construction 2 HR fire resistive walls and ceilings (50 lbs. fixture support) - Fiberglass reinforced polyester - thermoset box with galvanized steel hanger bracket - Size: Depth=2 7/16", Dia=4" - Mount with Nail-on backside HL hanger bracket for adjusting to additional wall/ceiling substrate - Speed Klamps™ factory installed