This professional proxxon micromot 110bf flexishaft is a highly flexible shaft that is suitable for all proxxon mini drills even the smallest shanks are fastened in the absolute centre no rattling or knocking by tool inserts dual ball bearinged milled steel shaft with tool holder for micromot steel collets ball bearinged shaft end on machine highly flexible core does not run hot when working on tight radii length 100cm for a maximum of 25000rpm