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KCT HSS-CO8 End mills are made from premium German Raw Material. Cobalt 8% Provides better wear resistance, higher hot hardness and toughness than high speed steel (HSS) end mills. There is very little chipping or microchipping under severe cutting conditions, allowing the tool to run 10% faster than HSS, resulting in excellent metal removal rates and good finishes. KCT HSS-CO8 End mills is a cost-effective solution.