Nylon-jaw pliers are used for shaping and sculpting wire and wire wrapping. The jaws are made of nylon to prevent damage to the wire you’re working with. These jaws protect the surface finish of wire or other materials handled with these pliers. They're also excellent for straightening any kinks out of wire. Over time you may need to replace the nylon on the jaws. You can do this simply with nylon jaw replacements.