Features： 1、40CR ALLOY STEEL: The chuck tool handle is made of 40Cr alloy steel material, with high hardness, good wear resistance and stable performance. 2、HIGH HARDNESS: Vacuum quenching treatment can realize carbon oxygen co infiltration, improve the hardness, and can withstand a certain impact and load. 3、HIGH ACCURACY: The shank is fully ground as a whole, with high centering accuracy, and effectively protects the connection of the taper hole of the power head. 4、PRESSURE DISPERSION: Good rigidity, the pressure is dispersed on the precise needle rollers of the cage during use, suitable for large cutting amount machining. 5、FOR CNC DEVICES: The tool holder has high accuracy and is widely used in CNC machining center and engraving machine, etc., convenient and durable. Specification： Item Type: Chuck Tool Holder Material: 40Cr Alloy Steel Model: NT30 ER32 Drawbar Thread: M12 Tail Aperture: Approx. 12mm / 0.5in Structure Type: Integral Accuracy: 0.003 Scope of Application: CNC machining center, engraving machine and other high speed machines Package List： 1 x Tool Holder 1 x ER32 Wrench