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. WingGard and WireGard twist-on wire connectors offer unsurpassed quality and durability for general purpose applications requiring the connection of 2 or more copper wires. WireGard connectors feature a straight type Polypropylene shell with side knurling for an easy grip while WingGard connectors feature a high-leverage, easy-on, wing-type design. The swept wings provide added turning torque and reduce the strain of multiple applications. Both types feature a thermoplastic shell which shields against environmental extremes and resists chemical action from hydrocarbons, diluted acid or alkaline solutions while the long skirt prevents exposure of bare wire. The zinc-plated square wire-spring inside instantly adjusts to the shape and size of the splice upon insertion ensuring a long-lasting connection that resists corrosion and exceeds UL standards for dielectric strength and wire pullout force. Flame-retardant properties resist heat distortion up to 105°C (221°F). Color coded for quick and easy size selection. Use for: Air conditioners, ceiling fans, doorbells, indoor lighting, switches, thermostats, ballasts, large and small appliances.