Item Type: CNC Toolholder Material: 20CrMnTi Model: BT30-ER32-100 Purpose: CNC Machining Toolholder Working Length: Approx. 100mm / 3.94in Nut Diameter: Approx. 50mm / 1.97in Spindle Taper: 7/24 Revolving Speed: 25000-30000RPM Body Accuracy: 0.002-0.005mm Coaxiality: 1. Please allow 0& 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. 1CNC toolholder, suitable for clamping milling cutters, drills, reamers and other cutting tools. 2Using highquality 20CrMnTi material, high wear resistance, more stable performance. 3The clamping force is super strong, not loose, not deformed, durable and longlasting. 4Use carburizing and quenching process, the surface hardness is high, can withstand a certain impact and load. 5It is widely used in CNC machining, with superb craftsmanship and easy installation.