Combination Masthead & All-Round Light - Black Housing - Fixed Mount - 3 3/16in. H

USCG certified for use on sail or power driven vessels under 20 meters (65.6 ft.) in length 3 mile visibility Black plastic and chrome plated zinc alloy top, chrome plated brass base Stowaway plug-in type with 3/4in. diameter anodized aluminum tube & gold plated contacts Clear lenses 12V bulbs included Screw size is 8