These 7-pin metal trailer sockets feature a robust housing made of real metal and aluminum, which is impact- and weather-resistant. Their pure copper contact pins and waterproof design ensure a more secure connection with your vehicles. These trailer sockets allow the electrical connection between a vehicle and a trailer or caravan with a 12V electrical system, transmitting the electronic signal from the car's lighting to the trailer. Suitable for trailers, caravans, cars, tow bars, bike racks, trucks, tractors, vans, and motorhomes.