C20-ER16M-100L 20mm Shank CNC Milling Extension Collet Chuck Holder Product Name : Collet Chuck;Material : Steel Model : C20-ER16M-100L;Shank Dia : 20mm Chuck Head Type : ER16M;Shank Length : 100mm Run-out Tolerance : 0.01mm;Color : Silver Tone Weight : 230g;Package Content : 1 xCollet Chuck