Easy-Twist Standard Twist-On Wire Connectors - Standard Grey Small Jar 22-14 AWG APPLICATIONS: Easy-Twist Standard Twist-On Wire Connectors have a flame retardant UL 94V-2 thermoplastic shell that provides excellent electrical insulation. Their fixed, precise square wire spring provides secure gripping of conductors. Their deep skirt entry provides protection from flashover and shorts. Sure-grip ribs improve gripping comfort. Compact design ensures proper installation, especially in tight spaces. Threaded funnel entry guides the wires into the connector easily. Pre-twisting of wires is not necessary. Zinc-plated springs for low contact resistance. 1000V max in fixtures and signs. UL 486C Listed Wire Connector. For Copper Wire Only.