Ribbed cap provides positive grip for fast, easy installation Accepts many different wire sizes without pre-twisting Used for copper wire only Ribbed cap provides positive grip for fast, easy installation Wire Connector Color: Blue For use with #22 to #14 AWG copper conductors Minimum Wire Range: 3 - #20 Maximum Wire Range: 3 - #16 Maximum Rated Voltage: 300V Temperature Rating: 105 °C / 221 °F Wire Strip Length: 3/8 in (1/2 in #16 and smaller) Intended only for use with copper wiring (Cu/Cu Only). Not for use with aluminum wires. For use in dry locations only UL 486C Listed and CSA 22.2 No.188 Certified UL 94V-2 flame-retardant shell