Sherline 2101 Sherline 1" Collet Pot ChuckThese 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). Note: Collet pot chucks are designed to material only on the face end, not through the collet. Maximum dripping depth is 3/16" (4.8mm)