Twister aluminum-to-copper connector provides a secure connection while preventing aluminum corrosion. Specially formulated corrosion-resistant compound provides cooler connections and increased conductivity. Features include swept-wing design for comfort, live-action, square-wire spring, hexagonal shape for standard nutdriver and no pre-twisting required. Purple. Shell rated for 105 degrees Celsius. UL (Underwriter's Laboratories) listed and CSA (Canadian Standards Association) certified.