A ring drill is a hollow cylinder with a cutting edge on the end. An annular groove is obtained as a result of drilling.

Advantages of ring drills:

1. The optimal sharpening angle makes ring drills universal for various steels.
2. The geometry of the drill prevents excessive heating and facilitates the easy removal of chips, the load on the teeth is evenly distributed.
3. The shape of the teeth and the spiral of ring drills minimizes the pressure on the processed material.