Perko Fixed-Mount Combo MastheadAll-Around Boat Navigation Light This Perko Fixed-Mount Combo Masthead Boat Navigation Light is certified for use on sail or power driven boats up to 65.6 ft. in length. It features a white polymer base with a chrome plated zinc alloy top that provides exceptional durability. With gold plated contacts and a fixed mount, this combo mastheadall-around boat navigation light offers great satisfaction. Features White Polymer Base Chrome Plated Zinc Alloy Top Certified