ER Collets 1.Material: 60Mn 2.Accuracy:0.005mm 3.Power clamping ... , milling, drilling, tapping, grinding and engraving operation etc.5.Models: ER8, ER11,ER16,ER20,ER25,ER32,ER40,ER50.6.Packing: inner ... more information, please kindly feel free to contact us. ER Collets Manufacture