NAS 907 type J standards, used in the aerospace industry Gold oxide, retains cutting fluid and prevent chip to tool welding 135-degree split-point angle is self-centering, reduces walking, good for hard material, and reduces pressure on cutting edges High speed steel (HSS) containing cobalt is a good combination of toughness and hardness, for use on drilling through hard substances Jobber-length drill bits is the most common length drill bit, suitable for a wide range of applications