... clamping ability 4.Hardness:HRC44-48 Products Features:ER Collet With Excellent quality1.Made of special Elastic steel material. ... , drilling, tapping, grinding and engraving operation etc.5.Models: ER8, ER11,ER16,ER20,ER25,ER32,ER40,ER50.6.Packing: inner ... suplly various machinery accessories such as Er collet, Sealed collet, Tap collet, R8 collet, 5C dollet, OZ collet, tool holder etc.If you need ...