Twist/bayonet lock design secures lens and cover to base. Includes a 9-Watt (#906) wedge base lamp and 7" wire leads for connection to 12 VDC power supply. Installs directly to deck with two #10 fasteners. Cover and lens conceal installation fasteners and seal water out of lamp and hull. For use on boats up to 39.4 ft. (12 meters).