1.Material:65Mn 2:size er8-er40 3.Hardness:HRC44-48 4.Accuracy:0.005mm-0.015mm sealed collet 5.used for drilling,milling sealed collets1.Material:65MN2.Hardness:HRC44-483.Accuracy standard:DIN6499.4.put drill in it,the coolant will go through drill.5.Modle no.ER16C,ER20C,ER25C,ER32C,ER40C. modle no.dDLER16C-d2-1016.627.5ER20C-d2-1321.631.5ER25C-d2-1625.634ER32C-d3-2032.640ER40C-d3-2640.646 ( ...