The Marrette XTP® is a high-quality, twist-on wire connector with a unique spring and cap grip design that sets it apart from the competition. The only wire connector to offer a non-winged, variable-volume live-action spring in the connector Accommodates a broader range of wire connection combinations Coated with 100% pure copper, which reduces the corrosion common to tin and zinc-coated products Finger friendly design offers a truer grip for less hand fatigue during repeated use