NSi easy-twist winged wire connector. Exceptional design makes twisting easier, ensuring proper installation - especially in tight spaces. Deep surface ridges provide better grip. Threaded funnel entry guides the wires into the connector easily. Swept-back Wing design provides handling comfort and increased torquing ability. Square wire spring provides secure gripping of conductors. Deep skirt entry provides protection from flashover and shorts. Flame retardant thermoplastic shell provides excellent electrical insulation. Temperature rating 105 Degrees C (221 Degrees F). pre-twisting of wires is not necessary. 1,000 Volt maximum in fixtures and signs. UL listed.