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Tungsten Solid End Mill , Carbide Long Neck Short Flute End Mills Description 1 ) High quality micro grain carbide 2 ) Coated 3 ) Helix angle: Customizable We use 100% original raw material, the micro grain tungsten carbide powder and cobalt powder(from German)to make the carbide rod, hardness can be 92.5-94.0(HRA), and T.R.S. is 4200-4800(N/mm2), this carbide rod can ensure the end mills with very strong abrasive resistance and impact strength. Original raw micro grain