CBN inserts for hardened material H chipbreaker series H chipbreaker series Excellent chip control when machining hardened material 3 chipbreaker for a wide range of machining applications KBN05M insert grade with superior oxidation resistance and wear resistance Small D.O.C. For hardened steel finishing Large D.O.C. For removing the carburized layer HH chipbreaker 55 HRC or more 1st recommendation HL chipbreaker 55 HRC or less HD chipbreaker
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