Features aluminum base with polycarbonate lens. Heavy-duty rocker switch is weather resistant for models with switch. High light output bulb #1141. Replacement for Freightliner, Peterbilt and other trucks. Body: Steel. Size: 6-1/8" diameter x 1-5/8" high. Mounting: Flange, three holes for #6 screws on 5-1/2" diameter circle.