Wire Connector Serice, a consumable used to crimp wires to connect nodes in a circuit. The material is made of UL-approved nylon 66, with fire rating of 94V-2 and 94V-0. How to use: Peel off the outer skin of the wire and insert it into the bushing. Press it tightly with crimping pliers. Features: The shell is injection-molded with nylon and the inner copper tube is extra long. It can increase the crimping range of the wire to make it easier to conduct electricity and clamp the wire even if it is strongly vibrated.