This is an OEM part sourced directly from the manufacturer. The key is found in Powermatic cutterhead planers. This part is made of metal, and is used in different places to secure the worm gear and the lead screw crank. You may require pliers when replacing this item. This product is available as an individual replacement part. For Use With: Jet 15S (1791210) 15" Spiral Cutterhead Planer 15HH (1791213) 15" Helical Cutterhead Planer