Drafttight, 4"D x 2-3/4"D, Ceiling Fixture Electrical Outlet Box, 26 CUIN With 14.3" To 22.5" Mounting Hanger Bar, 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 Vapor Tight Seal Preventing Flow Of Air Through Box, V-Clamps Provide Self Clamping Cable Entry, Rated For Ceiling Fixtures Up To 50 LB, UL Listed.