Specifications Included: The number size cobalt drill bit has a total of 60pcs from #1 to #60 (0.228"-0.040" or 5.79mm-1.02mm), you can choose the corresponding combination according to your needs Containing 5% Cobalt:The M35 cobalt drill is made of high-quality M35 cobalt steel, which has a hardness far exceeding that of ordinary high-speed steel drill bits. Specially designed for hard materials such as stainless steel, alloy steel, cast iron, etc 135° Split Points: The 135 degree precision grinding self centering pointed design can easily cut into the surface of the material. The precise spiral groove design ensures the fast and smooth discharge of iron chips, effectively preventing the drill bit from getting stuck or broken Versatile Application: The M35 drill bit set can be used in cutting stainless steel, cast iron, copper, aluminum and other soft metals, as well as plastic, wood and other material scenarios Precision Packaging: Each drill bit has a corresponding location for storage. Make your access orderly and more convenient。 At the same time, if you have any questions about the product, you can contact us at any time, and we will solve them for you as soon as possible StratMet 60Pcs Number Size Cobalt Drill Bits