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1: BT Number from 30-50
2: Material is special alloy steel
3 Good rigidity and high precision chuck
4.Material: Case-hardened steel ,process machine : CNCTuring center
5. With through hole for internal
6.ER11,ER16,ER20,ER25,ER32,ER40
7.quick delivery & competitive price & good service
BT ER Spring collet chuck / ER SPRING COLLET CHUCK/BT ER CHUCK