For use on boats up to 39.4' (12m) in length, provides 1 mile visibility. Twist/bayonet lock design secures lens and cover to base. Includes an 8 watt wedge base lamp and 7" wire leads for connection to 12V DC power supply. Install directly to deck with (2) #10 fasteners. Cover and lens conceal installation fasteners and seal out water. Lights are visible 112.5