Five Oceans 12V trailer electrical plug and socket connector with 7 pins is a great option for trailers, trucks, and RVs to connect trailer road lights to towing vehicles. Super simple installation and can be used to connect the taillights, brake lights, reverse lights, turn signals, trailer brakes, and auxiliary power. Marine grade ABS black plastic housing provides corrosion resistance. A perfect length of 3- 1/2 inches and brass terminals to ensure reliable electrical conductivity. SPECIFICATIONS: PLUG AND SOCKET Type: 12N Voltage: 12V DC Material : ABS Black Plastic Resistant and Brass terminals Plug Size: Length:3-1/2 inches (95mm) | Wire Hole Diameter: 5-16 inches (8mm) | Internal Diameter: 1-1/4 inches (32mm) Designed for trailers, caravan, RVs, and any towed vehicle Package includes: 1 x 7-pin plug and socket PRODUCT NUMBER: FO2354-C1