Description: C20 ER20-A Straight Shank Collet Chuck Holder Extension Rod CNC Milling Lathe   Specification: Material: Stainless Steel Shank: 20mm Shank Length: 80mm Total length: 115mm   Clamping range: 1-13mm   Holder precision: 0.008 Collet series: ER20-A (A type is a coarse thread、 for coarse、 medium finish.)   Features: Extend processing tools、 high processing、 through-hole、 cold inside、 high flexural、 shock、 accuracy; Extension rod diameter and the other parts are precision ground to eliminate imbalances、 increased stability during cutting. Tighten the nut directly、 high rigidity. Extremely powerful clamping force.   Package Included: 1pc x Chuck Holder   More Details: