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 myriad options, ergonomic designs and wire ranges. Unsurpassed quality and durability in a high-leverage, easy-on wing-type designHigh-dielectric shell features deep skirt design to prevent exposure of bare wireWing-Gard finger-pleasing wings are knurled for a surer grip and offset from the centerline for greater twisting leverageEasily removed for repeat usage on same size combination or largerSecure connections mean positive continuityThe expandable square-wire plated spring instantly adjusts to the shape and size of the splice, then bites down to thread onto the wires without ratcheting and creates a strong, vibration-resistant connection-no pre-twisting tools are necessaryTough thermoplastic shell shields against environmental extremesFlame-retardant, non-porous, and non-corrosive shell resists surface cracking and chemical actionTemperature rating: 105 degrees C, 221 degrees FSuperior flash-over protection