This is a fully hardened clutch center that is a direct replacement for a stock type clutch basket. It will work for both a chain drive and belt drive type. This center in the nicest one you will find on the market due to the tooling used and the fact that it is Vacuum Heat Treated which will give it a uniform strength all the way through the metal without putting excessive stresses on it during the hardening process. What we have seen on other centers available on the market is that they are flame hardened, which is not as consistent and only hardens the metal to a certain depth