Ceiling Fixture 4″ Diameter x 2-3/4″ Depth, Draft Tight, Electrical Outlet Box, 26 CUIN, Angled Side Nails For Mounting, For Use With Non-Metallic Sheathed Cable, High Strength Black Polycarbonate Withstands Temperature Extremes, Meets Energy Efficiency Requirements For New Homes, Features A 1/2″ Offset Flange To Ensure A Flush Fit In 1/2″ Drywall, Foam Gaskets Over Cable Entry Points Provide Draft Tight Seal Preventing Flow Of Air Through Box, UL Listed.