ER collet 1.Whigh precision 0.008 mm 2.Made of special elastic steel 3.We supply the competitive price and good service ER collet1.Material: 65Mn alloy spring steel2.Hardness: HRC45-483.Standard: DIN 6499B4.Concentricity: runout less than 0.008 mm5.Monthly capacity: 30,000 pcs ER11CER16CER20CER25CER32CER40CER50CTypeRangeTypeRangeTypeRangeTypeRangeTypeRangeTypeRangeTypeRange3C3--2.93C3--2.93C3--2. ...