Diameter diminution tapered
From the point to the shank
- Helps to release the sides
- Drill does not bite at the flutes
- No sticking
- Less friction, helps increase service life
Web tapering
- Ultimate durability and torsion resistance
- Fracture resistant
- Example from nature: tree in a strong wind
Partial hardening of the flute length
- Shaft is soft so that the chuck can grip
- Long lifetime of drill with high quality chuck