General description Selected high-quality 20CrMnTi material ensures high hardness and wear resistance. This milling collet chuck is widely used for clamping milling cutters, drills, reamers, and other cutting tools. The carburizing and quenching process enhances the handle's ability to withstand impacts and loads, providing strong toughness and super clamping force without loosening or deformation. Technical specifications Product model: CNC tool holder Model: BT30-ER32-70 Use: CNC machining Tool post working length: about 70mm Nut diameter: about 50mm Spindle taper: 7/24 Speed: 25000 U/min Main body accuracy: 0.002-0.005mm Coaxiality: less than 0.005mm Overall clamping accuracy: 0.002-0.005mm Hardness: 52-58 HRC Color: Silver Package Contents 2 x BT30-ER32-70 Milling Tool Holder Other information Note: Light reflection and different displays may cause the color of the item to differ slightly from the real thing. The measurement allowed error is +/- 1-3 cm.