... with 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 ... demands of different customers. More information about our ER collets, please visit our website www.qufuchongde.cn or call ... the world! er collet, SK collet, collet, collets, ER spring collet