Twist On Wire Connector, Color Tan, For Conductor Material Copper, Maximum Operating Temperature 221 Degrees F, Maximum Voltage 600 V, Minimum Wire Combination (2) 18 AWG, Maximum Wire Combination (4) 10 AWG, Contact Material Steel, UL 94 Flammability Rating V-2, Standards CSA- C22.2 NO. 188, IEC 998-2, IEC 998-2-4, UL 486C, W-S-610E, Wire Connector Style Wing, Insulation Material Polypropylene, Maximum Single Wire Size 8 AWG, Minimum Single Wire Size 22 AWG, Overall Height 1.14 in