Feature:1. Via hardened treatment, the chuck holder is durable to use, which is also suitable for inner hole milling cutter.2. Given that such collet chuck tool holder supports wide application, it is also suitable for various machine tools.3. Lathe tool holder is with high hardness for long life, after quenching and hardening.4. Made of high speed steel, chuck holder is not easy to damage, and you can use for a long time.5. Built to strict quality control standards, the milling tool holder's design is improved for more durability.Specification:Item Type: CNC tool holderMaterial: High speed steelApplicable Machine: Milling machineHardness: Approx. 55 ~ 58Accuracy: Within 0.003mmClamping Range: Approx. 1 ~ 20mm / 0.04 ~ 0.79inSpeed: 30000 rpmWhether Coated: Non-coatedShank Diameter: Approx. 20mm / 0.8inFMB Guide Post: Approx. 27mm / 1.1inApplicable Cutter Diameter: Approx. 80mm / 3.1in Package List:1 x CNC Tool Holder