GB's exclusive Uni-Lok Universal Wire Connector is a versatile and cost effective connector designed to accept a wide range of wire combinations. Unlike other connectors made with a hard polypropylene shell these connectors feature a softer nylon shell designed for comfortable twisting and mini-wings to provide additional torque. The Uni-Lok features a long skirt to prevent exposure of bare wire while the zinc-plated square spring inside instantly adjusts to the shape and size of the wires upon insertion. Use for: Large appliances, Indoor lighting, Switches, Air conditionersUniversal design, handles majority of wire connection needsSwept mini wings provide additional torqueNylon housing makes for softer more comfortable twist-on applicationStreamlined design for compact installationsSquare wire spring grabs and holds wires for secure connectionsLong skirt covers stripped wiresRated at 600V max in building wire and at 1000V max in lighting, fixtures/luminaries and signsCopper to copper connections only