· A Quality product by Grobet - USA · Popular jewelers handpiece with jacob chuck · To be used with a jewelers flexible shaft motor. · Variable chuck enables you to use all kinds of tools for drilling, polishing, filing, finishing, etc. · Useful for jewelers, sculptors,hobbyists. · Compares favorably with the Foredom #30 handpiece and ARK Precision handpiece · Runs from 0 to 20000 rpm depending on motor and pedal used · Chuck capacity 0 to 5/32" · Includes 1pc key