This tool by Lisle has three sizes of slotted tubes for working on different sizes of Deutsch terminals (12GA,16GA,20GA). Slotted tubes are made out of stainless steel which work and last longer than plastic disconnect tools. To use, slide appropriate size slotted tube over wire. Push tool into grommet, it will bottom out on the Deutsch terminal. Do not twist tool. Pull the wire terminal out of the connector.