Item Type: Collet Chuck Tool Holder Material: 40cr alloy steel Model: NT40 ER32 Rear Drawing Thread: M16 Tail Aperture: Approx.16mm/0.6in Structure Type: Monolithic Accuracy: 0.003 Scope of Application: CNC machining centers, engraving machines and other high speed machines Package List 1 x Collet Chuck Tool Holder 1 x ER32 Wrench 1Vacuum Quenching Treatment: The collet chuck is vacuum quenched, with high hardness, strong toughness, strong fatigue resistance, and can withstand certain impact and load 2Integrally Structure: The mill tool holder is integrally formed, with good structural rigidity, the pressure is dispersed on the precise needle roller of the cage during use, which is suitable for large cutting amount processing 3Overall Full Grinding: The shank is fully ground as a whole, effectively protecting the connection of the taper hole of the power head 4Fine Grinding Process: The external is brightly ground, beautiful and elegant, and the shank hole is fine grinding processed, has high centering accuracy 5Wear Resistance and Stable: The milling shank holder is made of high quality 40cr alloy steel, which has better wear resistance and more stable performance