This is a Submersible Side Marker light in Amber for use on Boat Trailers. You can really use this Side Marker light on any trailer where the mounting single stud style works. The Submersible qualities of this light make it ideal for Boat Trailers in saltwater or freshwater. This is a single stud mount side marker light that grounds to the trailer frame through the bolt. 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 Submersible Side marker light has a single wire operation, to be used for your clearance light operation. Measuring roughing 2 inches wide with a Stainless Steel Base and Polycarbonate Len and housing, and protruding about a 1 inch, its profile makes it very easy to mount on nearly any surface. This makes installing it on Fender steps very simply, as well as along the trailer frame. This is an incandescent light from Optronics, one of the top Brands of Trailer Lights, so its quality is top notch and is guaranteed to last. This Submersible Side Marker Light produces 12.8VDC with .2A.