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2 or 4 Flute End Mill for Stainless Steel / Slotting / Milling HRC 55 60 65 Description Diameter:0.2-3.0mm Hardness:HRC 55/60/65 Coated:TiAN,TiCN TiN and ARCO Type:Long neck square end mill 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