... , ER11, ER16, ER20,ER25,ER32,ER40 up to ER 50 2.A,M,UM and K type ER spring collet spanner1.Type ... ,ER 25,ER 32,ER 40 up to ER 50 2.Model:A type, M type, UM type and K type.3 ... .Material:65Mn steel Package:Company profile:We are a manufacturer from Shandong province in China. Our company established in 2003.Now we ...