14.0 Cu. In. 3.5" dia. round fixture support (15 lbs.) 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 - Old work residential construction 2 HR fire resistive walls and Ceilings (15 lbs fixture support) - Fiberglass reinforced polyester - thermoset box with galvanized steel snap bracket - Size: Depth=2", Dia=3 1/2" - Mount with Snap bracket/metal ears wall compression - Speed KlampsÖ factory installed