HSS STEEL DRILLS

They go through. They last:

For alloy and non-alloy steel.

HSS jobber drills, DIN 338 RN
HSS jobber drills with 1/4" hexagonal shank
HSS jobber drills, split point AC
HSS long series drills, split point AC
HSS extra long series drills, DIN 1869
HSS stub drills for rivets with split point
HSS morse taper shank drills, DIN 345 RN