20.5 Cu. In. 3.5" dia. round fixture support box for use with nonmetallic sheathed cable - Polyurethane flange for double drywall offset, 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) - air tight - Fiberglass reinforced polyester - thermoset box with galvanized steel adjustable bar hanger - Size: Depth=2 15/16", Dia=3 1/2" - Mount with Adjustable bar hanger - 16" to 24" on center joist application - Speed Klamps™ factory installed