... high hardness steel 2.Used in milling collet chuck 3.High precision ER Collet for Milling Collet Chuck DOHRE TOOL is ... end mills and tool accessories such as face milling cutter, carbide inserts(milling/turning), milling cutters, turning tool holders, collets, pull studs, ... . ER8-40 collets, OZ collets, which is used in milling collet chucks, high precision and high efficiency. Special offer for ...