WINGTWIST™ provides maximum torque for a variety of electrical applications while the copolymer shell and live-action spring expand for smooth, progressive tightening providing dependable connections. 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.