... , ER40 ER50 2.We supply competitive price and good service nut for collet chuck1.Size: ER8,ER11,ER16,ER20,ER25, ER32 ... ,T2, A, B, MINI.3.Material: alloy steel 40Cr4.Machine Type :Millineng Machine Modle No.DLTEOC 61814M14*1.0EOC 82619M20*1.5EOC ... 327233.5M60*2.5EOC 408537M68*2.5EOC 5010043M80*2.5 nut for collet chuck