The Clamp-Lock termination system provides a maintenance-free connection. This revolutionary system actually gets stronger as the cable is pulled, which provides peace of mind knowing this durable trouble-free solution can handle heat, shock and vibration. Most important, Clamp-Lock enables wiring termination up to 50 percent faster than conventional screw termination products resulting in a more cost-effective process. How Does it Work? Use the built-in gauge to measure how much wire casing should be stripped. Then, to connect the three wires, simply open the color-coded green, white and black cam levers, insert the wires and then close the cam levers-no tools are needed. The compression fi t receptor bites into the wire and doesn't let go. Slide the housing over the connection and lock it positively in place with two captive screws.