Set of 29 jobber length drill bits includes inch sizes 1/16″ to 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 the drill bit and provides wear resistance Self-centering 135-degree split point penetrates hard material without a pilot hole and produces small chips to reduce clogging Meets ANSI specifications.