... 0.015mm 3. hardness:HRC 44-48 4. full sizes High Precision ER Spring Collets 1. 65Mn2. Precision below 0.008, ... 0.010 or 0.015mm3. hardness:HRC 44-484. full sizes ER COLLETS SET 010800ER89 PCS1-5 mm(1,1.5,2 ... 015000ER5012PCS10-34mm(10,12,14,16,18,20,22,24,26,28,30,32,34mm)We mainly manufacturing and supplying ... ., etc. All these items are in series of different sizes. High Precision ER Spring Collets