Feature: 1. Using good-quality 20CrMnTi material, possess better wear resistance, more stable performance 2. Using carburizing and quenching process, which bring high surface hardness, strong fatigue resistance and high wear resistance, maintain the strength and toughness of low carbon steel in the core after quenching, so that the tool holder can withstand a certain impact and load 3. The handle is totally ground to effectively protect the connection of the taper hole of the power head 4. The surface is polished to be beautiful and elegant, the shank and hole are made of fine grinding technology, which has high centering accuracy 5. The product is integrally formed with good structural rigidity, and the pressure is dispersed on the accurate needle roller of the cage during use, which is suitable for large cutting amount processing Specification: Item Type: Collet Chuck Tool Holder Material: 20CrMnTi Model: NT40-ER32 M16 Uses: Milling machines, machine tools, lathes, drilling machines, etc. Structure Type: Integral Accuracy: 0.003 Speed: 30000RPM Scope of Application: CNC machining centers, engraving machines, accurate engraving machines and other high-speed machinesTaper Determination: NT40: Approx. 44.45mm / 1.8in. Package List: 1 x Collet Chuck Tool Holder