Sherline 2105 Sherline 10mm 1-1/4" Collet Pot Chuck These 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).