Description Drill America D/A29J-CO-PC 29-Piece Cobalt Drill Bit Set contains 29 m42 Cobalt Drill Bits sizes 1/16″ – 1/2″ x 1/64″ increments Sizes: 1/16″, 5/64″, 3/32″, 7/64″, 1/8″, 9/64″, 5/32″, 11/64″, 3/16″, 13/64″, 7/32″, 15/64″, 1/4″, 17/64″, 9/32″, 19/64″, 5/16″, 21/64″, 11/32″, 23/64″, 3/8″, 25/64″, 13/32″, 27/64″, 7/16″, 29/64″, 15/32″, 31/64″ and 1/2″. Drill America M42 Cobalt Drills are effective in drilling tough, high tensile strength materials like stainless steel, Inconel, and titanium. They are manufactured to Aerospace Standard 907 and display high red hardness, permitting speeds up to 30% greater than with conventional M2 high speed steel. Cobalt drills have a self-centering 135-degree split point penetrates hard material without a pilot hole and produces smaller chips that reduce clogging compared to a 118-degree point. Cobalt steel provides extended tool life compared to high-speed steel drill bits, and maintains the tool’s toughness and hardness in high drilling temperatures. A gold oxide finish acts as a lubricant and provides wear resistance, and the round shank accommodates most drill chucks. This Drill Set comes in a unique round drill index that combines form and function into 1 beautifully designed, easy to carry drill set. The shatter proof, water resistant case fits easily, anywhere you need it. Effortlessly grip the set in 1 hand as you would a travel coffee mug, leave it in the cup holder of your truck while on the way to your job or hang it on your belt when all hands are on deck. Set contains 29 m42 Cobalt Drill Bits sizes 1/16″ – 1/2″ x 1/64 increments Cobalt Drills are effective in drilling tough, high tensile strength materials like stainless steel, Inconel, and titanium Gold oxide finish acts as a lubricant and provides wear resistance Round shanks allow use with a wide variety of tool holding systems Manufactured to Aerospace Standard 907 and display high red hardness, permitting speeds up to 30% greater than with conventional M2 high speed steel Cobalt steel provides extended tool life compared to high-speed steel drill bits, and maintains the tool’s toughness and hardness in high drilling temperatures Effortlessly grip the set in 1 hand as you would a travel coffee mug or leave it in the cup holder of your truck while on the way to a job When all hands are on deck, hang the drill index on your belt whether you’re in the shop or field Unique round drill index combines form and function into 1 beautifully designed, easy to carry drill set.