2-4 gauge wire; terminal pins diameter: 0.35inch; voltage: 12-36 Volts DC; capacity: 175 Amps Simple Installation. Insert the wires into the terminal pins, then solder or crimp them. Connector ends are identical, so either ends is suitable for connection to the power or load side The bottom of the device features a fitted rubber boot to protect against dust, moisture and corrosion. 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. It's very easy to use and install. Insert the wires into the terminal pins, then solder or crimp them. Although all the components of this connector can withstand high voltages, this connector is designed for low-voltage (12-36 volts DC) Direct-current use (high-voltage connectors usually have a socket and plug arrangement, so the socket, or power end, can be fully enclosed). The terminal pins accept wire from 2 to 4 gauge.