The FCSL310 Step Light with stainless steel faceplate is U.L. listed for interior and exterior wet locations. The faceplate is 316 stainless steel and the housing is marine grade, corrosion resistant, heavy walled, high pressure die cast aluminum construction with (2) 7/8″ KO. Lens is 1/8″ thick, tempered opal heat resistant glass. Precision formed, reflector for maximum reflectance. Create the mood you need with a louvered faceplate and elegant stainless steel.