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USCG certified for use on power driven vessels under 20 meters (65.6 ft.) in length. 2-mile visibility. Black plastic top, chrome plated zinc alloy base 3/4" diameter anodized tube with locking collar, and 16 degree rake. Gold plated contacts. Screw size is 8. 2-Pin mounting base and 12V bulb included. Base: 3-3/4" x 1-5/8".