1、WEAR RESISTANT 40CR ALLOY STEEL: Made of excellent 40cr alloy steel material, possess better wear resistance and more stable performance 2、HIGH HARDNESS: Quenching and hardening with high concentricity, improving hardness and good comprehensive mechanical properties 3、STABLE AND HIGH SPEED: No slotted nut with wind resistance reduction design, reduce interference and vibration, make high speed processing more stable 4、HIGH ACCURACY: The surface is brightly ground, beautiful and elegant; the shank hole is finely ground, possess high centering accuracy 5、GOOD RIGIDITY: The product is integrally formed, with good structural rigidity. When used, the pressure is dispersed on the accurate needle rollers of the cage, which is suitable for large cutting amount processing