Attwood Anchor Masthead 12 Boat Navigation Light This Attwood Anchor Masthead 12 Boat Navigation Light features non-corrosion materials that include bases of glass-filled polymer and poles of highly anodized aluminum. The easy to grasp cam-lock stays locked in normal conditions and cannot vibrate loose. It also releases in extreme conditions and allows the base to swing down, reducing the chance of breakage to the base or the pole. Designed for use on boats up to 65.6 ft. 20 meters, this boat na