Spiralbohrer DIN 338, Flute; – HSS-Co 8 strong Sonderbohrer, preferably for Titanlegierungen and resistant to rust, acid and heat resistant Austenitischen steel for use with ist. is it the high-strength steels with low levels of hardness use under certain conditions and this drill for Sonderlegierungen like have Elloy, Inconell, Nimonic, etc. For material up to steel (N/mm²)