GN series is suitable for processing HRC≤65°steel parts, cast iron parts, die steel, special tools for quenching parts, special treatment of the cutting edge and unequal division process, adopts special grades of Chunbao tungsten steel, bronze nano-coating, and tool runout control Within 5μ, greatly increase the tool life and vibration, reduce the frequency of tool change, and the quality of real materials. This series of tools provide material certification!