... buffing, for grinding variable speed, 0-10,000 rpm. 31" flexible-shaft attached Multitasking Grinder. Give this adaptable Multigrinder a whirl, and ... 10,000 rpm. Best of all, it has a 31" flexible-shaft attachment with a 1/8" collet at the end.It ... 10,000 rpm. Best of all, it has a 31" flexible-shaft attachment with a 1/8" collet at the end. It ...