King Innovation 67091 Contactors' Choice Red Wing Wire Connector, Pack of 500 Red Wing Connector Designed for conventional copper/copper dry splices Perfect for indoor, dry applicatoins for both commercial and residential installations Tough thermoplastic or polycarbonate (PC) flame retardant shell Industry color-coded and No pre-twisting required. Max. Voltage: 300V or 600V. Wire Range: Min #18/Max #8