High performance and low price; The hardness of cobalt bearing center drill is HRB: 66-68 degrees It can ensure the surface finish and accuracy of the machined workpiece It can cut die steel and stainless steel with heat treatment hardness of 40 degrees The service life of the center drill is long, which greatly improves the work efficiency and reduces the production cost. It can be widely used in various machine tools for cutting It can punch more than 100 holes in automobile spring steel plate M35 material, can process stainless steel, die steel and other difficult to process steel parts. M35 is a 5% cobalt containing high-speed steel. Compared with M35 cobalt containing high-speed steel, it is cheap and easy to process. Through appropriate heat treatment, it can obtain high hardness, high red hardness and high wear resistance. The toughness and bending strength are not lower than ordinary high-speed steel, which can overcome early damage such as die edge collapse and crack.