WIRETWIST™ Wire Connectors offer an economical connector that brings a lot of value in comfort and performance. The fixed, live-action, square-wire spring threads itself as it draws wires into the connector, creating a secure pressure grip. The rugged, thermoplastic shell withstands extreme environments. The deep, wide-throated skirt protects against flashover and turned back strands providing excellent dielectric protection. The Combination WIRETWIST™/WINGTWIST™ Kit offers one easy solution for all your twist-on wiring needs. This 620-piece kit features an assortment of all models and sizes of WIRETWIST™ and WINGTWIST™ Wire Connectors in a handy plastic storage case. Perfect for maintenance and small project applications where several different wire connectors are required.