Twist-On Wire Connectors, Color Green, For Conductor Material Copper, Maximum Temperature 221 Degrees F, Maximum Voltage 600 V, Minimum Wire Combination (3) 14 AWG, Maximum Wire Combination (3) 10 AWG, Contact Material Steel, Standards UL Listed, Wire Connector Style Wing, Compatible with Product Type Solid or Stranded Wire, Insulation Material Polypropylene, Maximum Single Wire Size 10 AWG, Minimum Single Wire Size 14 AWG, Special Features Robust Spring Design for High Performance Holding Power