Twist/bayonet lock design secures lens and cover to base * Includes a 9-watt wedge base lamp and 7" wire leads for connection to 12 VDC power supply. Installs directly to deck with two no.10 fasteners. * Cover and lens conceal installation fasteners and seal water out of lamp and hull. For use on boats up to 39.4-Feet (12m) * Each light provides one-mile, 112.5 degree light visibility