For drilling low alloy steel (R<750N/mm²) to hard treated alloy steel (R>950N/mm²) as well as stainless steels. Cobalt makes it possible to drill hard and stainless steels that require sharpening with a lot of cutting throughout the drilling. Up to 3 times more holes drilled than a standard HSS drill. Self-centering split point sharpening for efficient attack in the material without prior pointing. HSS steel hardness index HRC 62/64.