External Cap: - Ergonomic wing design gives you a comfortable grip and more torque than the competition. The ergonomic shape reduces finger fatigue from repetitive installations. - The ergonomic wing shape allows excellent torque grip for your fingers as well as the option to use a standard 1/2" or 13mm hex driver to help twist the Marrette. - Made of durable polypropylene and 105°C rated to withstand high installation pressures. - Deep wide throat ensures full insulation coverage. - Highly visible yellow colour: indicative of a secure connection. - Inner Spring: Exclusive Live Action variable volume spring expands to accommodate even more wires with less twisting effort compared to other wide range wire connectors. - Range: #22 to #10, with no pre-twisting. - The square wire spring construction and funnel design gives a positive pressure conductor grip for solid or stranded wires - Approved for circuits up to 600V and lighting fixtures and signs up to 1000V. - For Copper wire only. - Convenient packaging - sized right and job-site ready!