★ PR40（PRA5）：ultra micro-grain diamond tungsten steel, extensively applied, it can be applied in medium speed cutting and finish cutting of various materials with HRC≦28°. It has excellent impact resistance and general wear resistance, and has extensive application. Generally, it is applied for thicker cutting, discontinuous cutting and bad part fixture. After being coated, it has better result, can machine various materials of HRC50°. Comparing with ISOK20&general tungsten steel, it has 1-2 times lifetime and excellent wear resistance

★HRF10(NRB10Z/HDR10): ultra micro-grain diamond tungsten steel, has excellent wear resistance, but its impact resistance is not so good. It  is applicable for medium and low speed cutting of high hardness materials (HRC45°-65°) requiring thermal refining and quenching or for  various materials having higher wear resistance and non-ferrous metal. Generally it is applied in good working condition\stable  cutting\excellent part fixing and continuous light machining. Corresponding to ISO K10.