FM8 Grayloy-Iron UNILETS Blank Cover With Screw, Hub Size: 1/2 IN, Form: 8, Mounting: Screw-In, Material: Stamped Steel, Finish: Zinc Electroplate, Standard: UL 514A, UL 514B, UL File Number E2527, CSA C22.2 No. 18.3, CSA 065183, NEMA FB-1, F