3-1/2 OW RND BOX 21.5 SNAP BRKT GRD

21.5 Cu. In. 3.5" dia. round fixture support box for use with nonmetallic sheathed cable - Machine tapped fixture holes, round exterior for easy cut-in, ground strap - Old work residential construction 2 HR fire resistive Ceilings - Polycarbonate - Thermoplastic box with galvanized snap bracket - Size: Depth=2 13/16", Dia=3 1/2" - Mount with Snap bracket/box flange wall compression