- 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.
- 3, Deburring chamfering elliptic hole enlargement twist drill the function of them was unable but it is possible.
- 4, The use of tools: drill, bench drill Work while water cooling can effectively extend the service life of drill bit,
- 5, Material: High speed steel 4241
