Carbide tool in accordance with international standards (ISO) different cutting its nature, is divided into P, M, K three categories, respectively, blue, yellow and red colors to identify:
    P class suitable for cutting steel with P01, P10, P20, P30, P40, P50 six, P01 high-speed finishing tool, the number of small, high wear resistance, P50 low speed rough turning, a large number, high toughness hilt painted blue to identify it.
    K class suitable for cutting stone, cast iron and other brittle materials, there are K01, K10, K20, K30, K40 five, K01 high speed finishing tool, K40 low speed rough turning such handle painted red to identify.
   M Class suitable for cutting larger materials.Such coated with yellow handle to identify it.