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 9-watt wedge base lamp and 7\" wire leads for connection to 12 VDC 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°. Size: 2-3/8\" diameter x 1-7/16\" vertical height.