attwood LED 3NM Anchor and Masthead Light 7" leads for connection to 12 VDC power supply. Twist/bayonet lock secures lens and cover to base, and provides easy lamp replacement. Includes an 8-watt wedge base lamp. Installs directly to deck with two 10 fasteners. Two-mile, 360 light visibility for use on boats up to 39.4 ft. (12 meters).