Two ball bearings in the turned, light aluminum hand piece and one in the drive end prevent tool bit chatter. The highly flexible shroud and core effortlessly transmit power without heating up even when bent tightly. Anti-kink springs at the grip and drive end. The flex shaft comes with 6 MICROMOT steel collets in sizes 1/32", 1/16", 5/64", 3/32", 7/64", and 1/8". The drive shaft is 7/64" and so either fits our 7/64" steel collet of our chuck. We recommend our Universal holder to fix the power tool properly. #PRO28620 Price.....$41.95 Proxxon Index