C/l 520Heavy-duty geometry for drilling in tough, high-tensile, and work hardening materials under extreme operating conditionsManufactured from M-42 8% cobalt for increased red hardness135° Split Point is self-centering for reduced thrust and easier penetrationTaper length provides longer overall length and flute length for deeper drillingStraw finish High Tensile Steel, Titanium, Armor Plate, Inconel, Cast Iron This listing is for each.