TurningMillingDrillingTechnicalInformationIndex General turning Chip breaker overview Positive inserts A Finishing HF P K Single sided chip breaker with good chip control. Suitable for finishing to medium machining of steel and cast iron. B AHF P M Ground, single sided chip breaker with good chip control. Wide range of application due to excellent balance of sharpness and cutting edge stability. EF M S C Single sided chip breaker with sharp cutting edge and large rake angle for finishing of stainless steel. NF M S D Single sided chip breaker with ground cutting edge and large rake angle for finishing. E-tolerance for high repeatability. NGF M S Single sided chip breaker with ground cutting edge and large rake angle for finishing. E-tolerance for high repeatability. E A 22