nut for collet chuck 1.ER8,ER11,ER16,ER20,ER25, ER32, ER40 ER50 2.competitive price and good service 3.are durable ... in use nut for collet chuck1.Size: ER8,ER11,ER16,ER20 ... ,ER25, ER32, ER40,ER502.Type: UM, T1,T2, A, B, ... .5M60*2.5EOC 408537M68*2.5EOC 5010043M80*2.5 nut for collet chuck