Twist On Wire Connector Color Red For Conductor Material Copper Maximum Operating Temperature 221 Degrees F Maximum Voltage 600 V Minimum Wire Combination (2) 14 AWG Maximum Wire Combination (4) 12 AWG Contact Material Steel UL 94 Flammability Rating V-2 Maximum Conductors 6 Standards CSA Certified UL Listed Wire Connector Style Standard Insulation Material Thermoplastic Polyester Maximum Single Wire Size 6 AWG Minimum Single Wire Size 18 AWG Overall Height 1.06 in