TurningMillingDrillingTechnicalInformationIndex Chip breaker overview General turning Positive inserts Medium machining A TC K P Single sided chip breaker with encircling cutting edge. Process reliable machining due to highest cutting edge stability. HM P K B Single sided chip breaker for medium machining. Wide range of application due to excellent balance of sharpness and cutting edge stability. EM M S C Single sided chip breaker with sharp cutting edge and large rake angle. Process reliable medium machining of stainless steel. Basic P K D Single sided chip breaker with encircling cutting edge for universal machining of steel and cast iron. Roughing Flat K E Single sided insert without chip breaker. Stable cutting edge design due to missing microgeometry. Excellent for roughing in cast iron. A 23