The FCSL1502 Step Light is U.L. listed for interior and exterior wet locations. The faceplate is marine grade 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 1/4″ thick, etched glass, heat resistant. Precision formed, reflector for maximum reflectance. The superior durability of stainless steel makes this fixture an excellent choice to light your walkway or stairs.