Screw machine length, for rigidity and strength * High-speed steel (HSS) containing cobalt is a good combination of toughness and hardness, for use on drilling through hard substances * 135-degree split-point angles are self-centering, to reduce walking, good for hard material, and to reduce pressure on cutting edges * Straw oxide reduces grinding stress within the tool * Round shanks, for use on a variety of tool-holding systems