The terminal of these winch battery quick connect are made from silver plated copper, it has strong high conductivity also keep a stable voltage and current. Connector Handle Makes disconnecting of connectors quick, easy and safe. Easy Installation: Just put the cable in terminal, solder or crimp them, then slide them into the back of plug and lock in place.Mechanically keyed housings prevents accidental component mating. This connector kit allows for quick and convenient connect/disconnect of power from a winch or from another electrical device such as a remote battery charger, trailer, etc. Current: 175A Voltage: 600 Volts (Max) Wire Size Range: 2-4AWG Colour: Red Material: Plastic+Rubber Package Contents: 2 * Dust Cover 2 * Connectors 4 * Terminal pins Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.