1. The body of large hole drill bit is made of military special steel, which has low failure rate of breaking and cracking.
2. High quality forging process to improve the fatigue strength of drill bit steel body.
3. Ultrasonic and magnetic particle flaw detection of drill steel body, eliminate material and forging defects, reduce the 
4. Enlarge the carbides of the drill bit to improve the service life of the carbides.
5. CNC machining the drill steel body to ensure the machining accuracy of the drill bit.
6. The specially made foot valve has high strength and good toughness, which guarantees the performance of the drill bit.
7. The drill spline matches the shock-absorbing buffer strip to improve the service life of the spline.