The Easy-Twist PIWC-8-C 40-Count Carton of Grey Push-In Wire Connectors are designed for use on eight solid or stranded wires in the 22-12 AWG size range. They???re made from flame-retardant thermoplastic and rated for an operating temperature range of -30?? to 105?? Celsius (-40?? to 221?? Fahrenheit). The push-in design uses two blades to form secure and fast connections between wires without any twisting or taping. Their compact in-line design is useful for applications in tight areas or anywhere else you need to connect wires.