1、ACCURATE AND BALANCED: The taper of the tool holder is ground to AT3 accuracy for maximum spindle contact. Certified for accuracy and balance 2、HIGH EFFICIENCY AND SPEED: CNC tool holder does not need to use nuts, reduce interference during processing, more suitable for high speed processing 3、STABLE STRUCTURE: Chuck holder built in screw pull back design, improve overall rigidity, reduce vibration, more stable 4、COMPACT AND PREVENT VIBRATION: Small front end design, no vibration guarantee, mounting screw size is M5x70 5、CONVENIENT LOOSEN: Chuck holder inner hole adopt cone angle design, easy to loosen the tool, bring large clamping force, improve stability 1 x CNC Tool Holder1 x Storage Box Item Type: CNC Tool HolderMaterial: 20CrMnTiSpeed: 30,000rpmMounting Screw: M5x70