Set of 21 short length drill bits includes inch sizes 1/16" through 3/8" in 1/64" increments * High-speed steel (HSS) provides hardness for wear resistance * Black oxide finish reduces wear while promoting chip and coolant flow on ferrous materials * Self-centering 135-degree split point penetrates hard material without a pilot hole and produces small chips to reduce clogging * Extra thick web for increased strength and rigidity compared to standard drill bits