Welcome to My Stores, Happy Shopping. Drill America – D/A29J-CO-PC 29 Piece M42 Cobalt Drill Bit Set in Round Case. 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. We will respond to you within 24 hours and do our best to help you out!