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. WireGard twist-on wire connectors are designed 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. The inner spring is zinc-plated to resist corrosion and has a tight square profile to make quick secure contact with wires and ensure connections with positive continuity. These all-purpose connectors require fewer turns to meet required torque and meet or exceed UL pull out and dielectric test requirements