Gardner Bender Wire Connectors are engineered to exceed the expectations of professional electricians. Perfect for commercial or residential applications GB Wire Connectors offer world class quality, performance and application versatility. Connectors provide maximum application flexibility by offering contractors and do it yourselfers myraid options, ergonomic designs and wire ranges, they are designed to require fewer turns to reach required torque and meet or exceed UL pull out and dielectric test requirements. Wire connectors in a wide variety of designs and sizes for dependable secured connectingExpandable square wire spring creates a strong vibration-resistant connectionDeep skirt design helps prevent exposure of bare wiresProvides superior flash-over protectionTough, thermoplastic shell, shields against environmental extremes9 pieces include two GB-1 #22 to #16 AWG wire range, one #20 with one #22 minimum wire and two #16 maximum wires, two GB-3 #22 to #14 AWG wire range, three #20 minimum wires and four #16 with one #20 maximum wires, three GB-4 #18 to #10 AWG wire rang