BT30 BT40 SK10 SK16 SK20 Tool Holders BT GSK/SK high Speed Collet Chuck Holder 1.20CrMnTiH BT Tool Holder 2.MAS403 3.HRC55-60 4.Precision below 0.005mm 5.High durability 6.BT Tool Holders are applied for a variety ofprocessing, including drilling, milling ,tapping & grinding... Product Model:ModelClampingLL1D1ColletsBT30SK10-603-10603329SK10BT30SK10-909063BT30SK16-603-16603340.5SK16BT30SK16-909063BT40SK10-603-10603329SK10BT40SK10-909063BT40SK16-603-16603340.5SK16BT40SK16-909063BT40SK20-903-20906351SK20BT40SK25-906-25.4907056.5SK25