Feature: 1. Selected high‑quality 20CrMnTi material, high hardness, wear resistance. 2. It is widely used for clamping milling cutters, drills, reamers and other cutting tools. 3. Carburizing and quenching process to enable the handle to withstand a certain impact and load. 4. Strong toughness, super clamping force, no looseness, no deformation. 5. Exquisite craftsmanship brings a smooth surface and will not hurt your hand operation. Specification: Item Type: CNC Toolholder Material: 20CrMnTi Model: BT30-ER32-70 Purpose: CNC Machining Toolholder Working Length: Approx. 70mm / 2.76in Nut Diameter: Approx. 50mm / 1.97in Spindle Taper: 7/24 Revolving Speed: 30000RPM Body Accuracy: 0.002-0.005mm Coaxiality: <0.005mm Overall Clamping Accuracy: 0.002-0.005mm Hardness: 52-58HRC. Package List: 1 x Toolholder Note: 1. Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.