Sherline 2103 Sherline 10mm 3/4" Collet Pot ChuckThese Sherline collets can be easily machined and are especially designed to hold larger and odd shaped parts. A 1/8" (3.17mm) dowel pin is included with the collets to close on while the face is being machined. They are used with WW collet adapter and drawbar (P/N 1161).