Under ideal conditions, uniform wear should be seen along the entire cutting edge.
Drilling tools should be reground when the wear land has grown to a specific width (VB) along with a certain amount of cratering (KB).
| Maximum flank wear (VB) in mm | |||
| Area | |||
| Drill diameter in mm | 3 | 2 | 1 |
| 3.00 – 6.00 | 0.20 | 0.20 | 0.20 |
| 6.01 – 10.00 | 0.25 | 0.20 | 0.20 |
| 10.01 – 14.00 | 0.25 | 0.25 | 0.25 |
| 14.01 – 17.00 | 0.30 | 0.25 | 0.25 |
| 17.01 – 20.00 | 0.35 | 0.30 | 0.30 |
| Crater wear (KB) in mm | |||
| Area | |||
| Drill diameter in mm | 3 | 2 | 1 |
| 3,00 – 6,00 | 0.20 | 0.20 | 0.20 |
| 6,01 – 10,00 | 0.25 | 0.25 | 0.25 |
| 10,01 – 14,00 | 0.30 | 0.30 | 0.30 |
| 14,01 – 17,00 | 0.30 | 0.30 | 0.30 |
| 17,01 – 20,00 | 0.35 | 0.30 | 0.30 |