1、40CR ALLOY STEEL: The milling chuck holder is made of 40Cr alloy steel material, with high hardness, good wear resistance and stable performance. 2、GOOD PERFORMANCE: Quenching and hardening treatment, high concentricity, ensuring high hardness and good comprehensive mechanical properties. 3、STABLE STRUCTURE: Non slot nut, wind resistance reduction design, reduce interference and reduce vibration, and make high speed processing more stable. 4、HIGH ACCURACY: The surface of the chuck holder has fine grinding, glossy and beautiful, with high centering accuracy, suitable for SK10 collets. 5、GOOD RIGIDITY: Integral design with good structural rigidity, the pressure is dispersed on the needle roller, suitable for large cutting amount processing.