The choice is between a Cat or a BT taper spindle. The pull studs are specific to each one. You can not interchange them. BT is more popular outside the US. Cat tapers are more popular in the US. At least I think so. I know it's not so easy to get BT tooling here as Cat tooling. I don't really see any perfomance advantage though. Get what is plentifull in your area. |