This is a unique add-on tool for wire strippers. It strips back the sheathing on various types and sizes of non-metallic cable without nicking or scoring the wire. It attaches to most wire strippers that have wire bending holes. Your wire stripper becomes more versitle. No need to ever have another tool or knife to strip back cable sheathing. This is the ORIGINAL tool. Do not be fooled by other imitations that DO NOT work as well.