These stainless steel bodied, 7” diameter warning lights, surface mount to a vertical, planar vehicle surface using 4 customer supplied #8 or #10 screws on a 6.25” bolt circle. The vehicle warning light includes a 10mm thick closed cell foam pad that compresses to seal between the lamp body and the mounting surface. Wire exit into the vehicle must be placed so that lead wires can pass directly from the lamp through the mounting surface without being pinched. All holes for passing wires must use a protective grommet. - Enhanced corrosion resistant lamp back / 304 stainless steel - 3 year warranty on lamp back