High-Speed Steel (HSS) Step Drill, Color : Silver

More than 60-65% of holes in the metal cutting industry have a chamfer at the start. Conventionally, drilling and chamfering have been two separate operations in hole-making.
For increasing productivity on machining centres, there is a trend to combine operations on the same axis for hole making. Typical examples are tap holes, rivet holes , etc. Step drills are mainly used for countersinking and counterboring operations.