This is a handy clutch tool used for removing your clutch nut. It is made of hardened steal and has 2 sizes (one on each end) allowing it to work on many Honda engines. It is designed to be used with a 1/2″ drive extension and works on the following models: All Honda 50cc and 70cc engines All Honda XR75 All CRF110 All TRX90 Most Chinese Honda replica engines If your aren't sure if it fits your model, the smaller size on the tool is 25mm and the larger size is 30mm.