Sherline 8.0mm Collet Adaptor & Drawbar P/N 1163 These collets are manufactured by Sherline and are built to standard WW specifications; however, Sherline WW Collet Adaptor & Drawbar Sherline has come across collets that are called WW and will not fit Sherline's drawbar and adapter. Be sure to check WW collets made by other manufacturers to be sure they fit Sherline's adapter before you purchase them.