1. including all kinds of application such as ER11,ER16, ER25, ER32, ER40 2. internal Through Coolant. Collets high precise(1) including all kinds of application such as ER11,ER16, ER25, ER32, ER40(2) Clamping range(mm): 0.5-1.0mm(3) internal Through Coolant. Collets with high precise with internal Through Coolant