For use on boats up to 39.4' (12 m) 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. Install with (2) #10 fasteners. Cover and lens conceal installation fasteners and seal out water. Visible 225. Size: 2-3/8" Dia. x 1-7/16" H.