Red LED 2" Round Clearance/Side Marker Light Kits with Grommet Truck Trailer RV 1 Round Flush Mount Submersible Trailer Light Includes two pin water tight plug with 6 inch leads 2" Diameter light, requires 2-1/4" mounting hole Waterproof, great for marine or trailer applications Our lights are tested by a lab to make sure they can withstand vibration, wet conditions, movement, and that the light is bright