Trailer lights can be fragile, but they are completely necessary for towing. Whether you're a contractor on your way to the jobsite or just a casual fisherman heading to the boat landing, you need working trailer lights to tow safely and legally. For any towing setup, CURT offers quality, DOT-approved trailer lighting, including complete wiring kits, combination lights and replacement lighting components. This spool of 16-gauge bonded wiring includes 25 feet of color-coded wire for rewiring a trailer or splicing in a connector. The 4-wire construction can be used for either 4-way flat or 4-way round plugs and sockets.