With clear Fresnel lenses, these lights are bright with 2 nautical miles of visibility. For use on power vessels under 20m or 656”, Perkos Fresnel Stow-A-Way Plug-In Pole Light is functional and great for recreational boats operating from dusk till dawn. These lights are easy to install and slide (or stow) out of the way when not in use. Key Features Clear Fresnel globe with black polymer top and a chrome plated zinc allow base provide a crisp look Includes bulb and mounting base (mounting screws sold separately) Locking collar on pole locks light into place when in use Slide arm down and out of the way when light is not needed Bright light can be seen up to 2nm away Waterproof base cover for protection Plug-in base dimensions are 3-1/4" x 1-5/8" Pole diameter is 3/4"dia. 16º rake For more information including mounting instructions, please refer to the Perko installation manual.