Description: ER20 Collet Chuck Holder CNC Milling Lathe Tool. Taper Shank Length: 100mm/4inch Collet Type: ER20 Great processing and fine making tool. Suitable for CNC milling lathe to improve the hardness and endurance of the surface. Specification: Material: chrome steel Size: C20-ER20A-100L(Total Lxshank Lxshank dia): approx. 140x100x20mm/5.51x3.94x0.79inch Package Includes: 1 Piece Collet Chuck holder Note: Please allow slight dimension difference due to different manual measurement