This tool will remove Miche 20T and 30T ratchets. It like a freehweel tool and should be used in the same way. Dismantle your hub. Place the wheel over the tool held in a vice and turn the wheel anticlockwise. A great workshop tool. So a worn or damaged ratchet ring does not mean a new hub anymore. When I say these hubs can carry one forever I mean it. Every part is replaceable.