Perko's all-round light with fixed mount features a "reduced-glare" design. Black polymer top with clear fluted lens and frosted globe and black polymer base. Durable anodized pole. Uses #8 screw size. Comes with 12V bulb. Base: 1" x 2-5/8". Pole: 3/4" diameter. 7-1/8"H. Certified for use on power-driven vessels under 65.6' in length.