needed this tool for bearing removal and without it, I would have ruined my new bearings. They needed to go on and off to set pinion preload. If you don't know what that is, you probably shouldn't even be looking at this. The cheaper solution, after the fact, was to buy a new bearing and grind the inner sleeve to allow for the bearing to slip on and off the pinion without having to use this puller everytime. In the end, I'm glad I bought it tho....