Twin Cam Primary Drive Locking Tool for Harley Davidson 1941- 2006. This tool is a must for any owner! Made from quality Delrin for years of use by the home mechanic or the professional tech. Delrin means the tool will not scratch or damage your bike! This tool is brand new. A must have tool to lock the primary drive to remove or install the motor sprocket and clutch hub nut. Will fit most Primary Drives. Proudly manufactured and assembled in the United States.