Set of metal drill bits DIN 338
HERMAN QDM-42 HSS-E Co 5%
25 drill bits in set

Right-hand drill bits with cylindrical shank made of HSS M35 high-speed steel with 5% cobalt admixture, with reinforced core:
high resistance to elevated temperatures and to breakage of the drill bit during drilling

Tip angle 135° with "split point" according to DIN 1412 C (for diameters of 3 mm and more):
only slight resistance to sliding is felt when drilling, ensures very good chip evacuation of the drilled material and prevents slipping when drilling on rounded objects without prior pitting

Sharp drill bit chips:
Good for removing long chips, especially when drilling softer materials

Drill bit surface polished, without additional coating:
It reduces friction when drilling and allows sharpening of the tip and the whole spiral

Recommendation:
Use cutting oil when drilling for increased durability