ERG Tapping Collet for Tapping Machine is made of high quality 65Mn material, with hardness of HRC44-48. We produce alll size of ER16G, ER20G, ER25G, ER32G and ER40G collets. We have exported to humorous countries, and establish good cooperate relationship. Accuracy is from 0.005mm to 0.015 for your reference. We also manufactures kinds of CNC machine tool accessories including collet chucks, pull studs, retention knob, spanner and wrench and other related products.