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 comfort while 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 and air conditioners.