Ceiling Fan & Fixture Draft Tight, Saddle Box, With V-Clamps & Foam Gaskets, 4" Round, 16 CUIN, For Use With Non-Metallic Sheathed Cable, Center Screw 4" x 4" x 3-5/16"D, Polycarbonate Withstands Temperature Extremes, Meets Energy Efficiency Requirements For New Homes, Features A Drywall Flange With Foam Gasket Over Cable Entry Points, Provides Draft Tight Seal Preventing Flow Of Air Thru Box, 70 LB Fan/Fixture, UL Listed.