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