High Precision ER Spring Collets 1. 65Mn 2. Precision below 0.008, 0.010 or ... or 0.015mm3. hardness:HRC 44-484. full sizes ER COLLETS SET 010800ER89 PCS1-5 mm(1,1.5,2,2.5 ... supplying various of Tool Holders & Machine Tool Accessories, such as Collets Chuck Sets, Boring Heads Sets, Tapping ColletsSets, Keyless Drill Chucks ... are in series of different sizes. High Precision ER Spring Collets