Perko telescoping all-round light with clear Fresnel globe and black polymer top. Base is constructed from chrome-plated zinc alloy material for dependable, long-term use. Anodized pole is designed with locking collar. Uses #8 screw size. Mounting base and 12V bulb are included. Pole: 3/4" diameter. Overall: 3-3/4" x 1-5/8". Certified for use on power-driven vessels under 65.6' in length.