Description: It's special designed to supply power for tail lights, turn signals and brake lights as well as a ground connection. There is no need for splicing wires, you can extend towing lights without consequently having a dimmer light. Well sealed spring loaded dust cover protects adapter from dust when leaving unused, metal points make good rust prevention and conductivity. Connector with trailer ends. For all types of trailers including marine boat trailers, motorcycle trailers, ATV trailer, and other cargo utility trailer hitches. Specification: Color: Black Material: Metal, Plastic Voltage Range: DC 6-24 Volt Total Length: 43cm / 16.93" Screw Thread Diameter: M5x0.8 Screw Size: 22.5x8mm / 0.89''x0.31''(L*Max.D), 43x8mm / 1.69''x0.31''(L*Max.D), 8x7mm / 0.31"x0.28"(L*Max.D) 4 Pin Plug Size: 4.3x3.2x1.2cm / 1.69''x1.26''x0.47''(L*W*H) 7 Pin Plug Size: 10x6.8x6.8cm / 3.94"x2.68"x2.68"(L*W*H) Package Included: 1 x Trailer Plug 3 x Mounting Bracket 8 x Screw 6 x Nut 1 x Instruction Manual