559 Series Short Length Drill Set in Metal Case – Sizes in Set: 1/16″ – 1/2″ x 32nds; Number of Tools: 15; Material Type: HSS; Point Angle: 135 Degrees; Finish/Coating: Gold Oxide Finish Set of 15 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 Made in the USA.