a replacement clutch for most 50cc-125cc full automatic transmission BUT not all. Chinese manufactured brands and models. Very popular in smaller ATVs. Clutch details: Rear clutch for 50-110cc engine 17 tooth basket - 6 tooth spline inner - 24 tooth on outer Spline hole diameter: 17mm [.67"] Basket diameter: 110mm [4.33"] Basket height: 28mm [1.10"] Fits full auto only Known to fit most full auto smaller ATVs. Check pictures and measurements to be sure this is the correct clutch for your application.