This cam bushing driver allows you to install new cam bushings in your pre-unit or unit Triumph engine properly. This aluminum drift is machined to fit your inner cam bushing that goes into the blind on the primary side of the case as well as the outer cam bushing on the timing side of the case. This aluminum drift will not damage your case or your new cam bushings and is specially made to make your life easier! The right tool for the right job makes all the difference. The aluminum sleeve included slips over the tool to keep it sized exactly right as the inner and outer cam bushings have different inside diameters.