Product Information
- High strength and hardness;Wear resistance and corrosion resistance.
- 3, Deburring, chamfering, elliptic hole enlargement, twist drill, the function of them was unable, but it is possible.
- Features:
- 1, The ladder of its unique structure, a bit can open a variety of specifications of aperture.
- 2, Do not need to use center punch, compared with the ordinary twist drill is not easy to be broken.

















