UL approved for use with 4 in. Round surface mounted fixture UL approved for use with 1/2 in. Nominal electrical rigid metal Conduit Approved for the following All-Pro wall and eave surface mount Fixtures above 4 ft.: All-Pro mss and mst outdoor LED Fixtures and defiant mss and mst models Approved for the following All-Pro wall, eave, and Conduit mount Fixtures above 4 ft.: All-Pro fss, fsl, and ftr outdoor LED Fixtures