The FCSL308 Step Light is U.L. listed for interior and exterior wet locations. The faceplate is brushed marine grade 316 stainless steel finish 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 glass, heat resistant. Precision formed, reflector for maximum reflectance. Add elegance and longevity to your walkway or stairs with this long lasting stainless steel fixture.