Designed for making ground connections and bonding non-metallic sheathed cable|Contoured wings for maximum leverage|Live action, square wire spring provides superior grounding connections|High leverage, contoured wing design provides superior torque on every twist|Copolymer shell expands for smooth, progressive tightening providing dependable connections|Removable for repeat usage on same size or larger combinations|The Wing-Nut Wire Connector provides an easy, secure grip when connecting a wide range of wires|The specially designed contoured wings make for extra torque and quick work on any electrical job|The wide range, live-action spring is flexible enough to handle small combinations with ease but then expands to accept large combinations when you need it|It can also be reused on same size or larger combinations for quick and easy circuit changes and additions|The Wing-Nut also features a tough, copolymer, flame-retardant shell that withstands environmental extremes with a deep skirt that provides maximum dielectric protection to prevent flash-over and turned-back strands