FM7 UNILETS Form-IN-Place Clip Cover With Integral Gasket, Hub Size: 3-1/2 - 4 IN, Form: 7, Mounting: Screw-In, Material: Stamped Steel, Finish: Zinc Electroplate, Enclosure: NEMA 3R, Standard: UL File Number E2527, CSA 65183, Class 4413