Twist On Wire Connector Color Blue/Orange For Conductor Material Copper Maximum Operating Temperature 221 Degrees F Maximum Voltage 600 V Minimum Wire Combination (2) 22 AWG Maximum Wire Combination (4) 12 AWG Contact Material Steel UL 94 Flammability Rating V-2 Standards CSA Certified UL Listed Wire Connector Style Wing Insulation Material Polypropylene with TPE Overmold Maximum Single Wire Size 12 AWG Minimum Single Wire Size 22 AWG Overall Height 1.05 in Overall Width 0.56 in