... Nc shank. As a speciallized manufacturer of ER collets, QuFu ChongDe Precision Machinery Co.,Ltd has many ... years mature experience on how to make ER collets.We choose the high grade spring steel-65 ... of ER collet, such as ER8,ER11,ER16,ER20,ER25,ER32,ER40,ER50 etc. The clamp force ... demands of different customers. More information about our ER collets, please visit our website www.qufuchongde.cn or ...