Set of 29 short length drill bits includes inch sizes 1/16" through 1/2" in 1/64" increments * Cobalt steel provides extended tool life compared to high-speed steel drill bits when drilling hard materials * Gold oxide finish lubricates and provides wear resistance 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