Perko 4.5 Fixed Mount All-Round Boat Navigation Light This Perko 4.5 Fixed Mount All-Round Boat Navigation Light is certified for use on power driven vessels up to 65.6 ft. in length. It is designed for extreme durability against harsh marine environments and offers added protection from corrosion. With a clear fresnel globe, this boat navigation light offers exceptional visibility. Features Black Polymer Base Corrosion Resistant Certified For Use On Power Driven Vessels Up To 65.6 ft. In Length