This is a Submersible Side Marker light in Amber for use on Boat and Utility Trailers. You can really use this Side Marker light on any trailer where the mounting style works. The Submersible qualities of this light make it ideal for Boat Trailers. This is a single stud mount side marker light. Typically you would be through bolting this light to you trailers frame or Fender bracket, which would require access to both sides of the mounting surface. This Side Marker light will ground directly to the frame of the trailer through the bolt. This Submersible Side marker light has a single wire operation, to be used for your clearance light operation.