Perko Light All-Round, White. 30" Tall. For use on power driven vessels under 65 feet (20 meters) in length. Telescoping type, 2 mile visibility, complete with 12 volt bulb, 3/4" diameter anodized aluminum tubes. Clear fresnel globe, black plastic top, chrome plated zinc base. Base length 3-3/4", width 1-5/8", screw size #8.