Lisle's Deutsch Terminal Tool, No. 59600, works on OEM electrical connectors used on trucks and equipment such as Caterpillar, Kenworth, Peterbilt, Freightliner, Mack and more. The tool also fits some Harley Davidson and industrial equipment connectors. Fits 14-16 AWG and size 14 contacts, 16-18 AWG and size 18 contacts, and 20-24 AWG and size 20 contacts. To use, slide appropriate size slotted tube over wire. Push the tool into the grommet, bottoming out the tool on the terminal. Without twisting the tool, pull the wire-terminal out of the connector.