Features: 1. Unique step structure, one drill bit can open a variety of specifications and sizes of apertures, and only step drills can reach a box of drill bits.
2. No need to use center punch, and it is not easy to break compared with ordinary twist drill. For on-site construction, one step drill is suitable for multiple specifications.
3. Deburring, chamfering, round hole reaming can complete functions that twist drills cannot.
4. Compared with ordinary twist drills. The shaking is small, and the beautiful aperture can be opened without using the center punch.

5. Use tools: both pistol drill and bench drill.