This tool is designed to guide and keep alignment of the drill bit when drilling out broken exhaust studs. A follow up with a tap is all that is needed to clean up threaded hole. This tool can be used with motor in most frames. Works on Evolution Big Twin 1984-2000, Twin Cam 1999-2017, Milwaukee Eight 2017 to present, Evolution Sportster 1986 to present and air cooled Buell 1987-2010.