... accutacy.3.Runout: 0.005mm-0.015mm4.Used for boring, milling, drilling, tapping, grinding and engraving operation etc.5.Models: ER8, ER11,ER16 ... of machine tool accessories in China. We can suplly various machinery accessories such as Er collet, Sealed collet, Tap collet, R8 collet, 5C dollet, OZ collet, tool ...