Feature:1. Selected highquality 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 ToolholderMaterial: 20CrMnTiModel: BT30-ER32-70Purpose: CNC MachiningToolholder Working Length: Approx. 70mm or 2.76inNut Diameter: Approx. 50mm or 1.97inSpindle Taper: 7 or 24Revolving Speed: 30000RPMBody Accuracy: 0.002-0.005mmCoaxiality: andlt 0.005mmOverall Clamping Accuracy: 0.002-0.005mmHardness: 52-58HRC.Package List:1 x ToolholderNote:1. Please allow 0and 8209 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.