1、Good Wear Resistance: Using excellent 40cr alloy steel material, has better wear resistance and more stable performance. 2、High Hardness: Quenched and hardened, the bracket has high concentricity, improved hardness and has good comprehensive mechanical properties. 3、Resistance Reduction: Designed with no slotted nut, resistant to wind, reduce interference and vibration, make high speed processing more stable. 4、High Centering Precise: The shank hole adopts fine grinding process, has high centering precise, the surface is polished, has beautiful appearance. 5、Good Rigidity: Integral molded, the holder has good structural rigidity, the pressure is dispersed on the precise needle roller of the cage, suitable for large cutting amount processing.