... and Germany 4)low wearing,prevent rust,no burr Corrugated cardboard slotter machine knives :1):Hardness:HRC 61-622)Thickness: 7.5mm ... , pressing,sintering,milling grinding, Germany grinding machine ,CNC machine etc.7)Commodity list:: CommodityProjectCorrugated cardboard slotter machine knivesMaterialSKD11,D2,DC53Tooth shapetriangle,cavernousHole positionupper,bottomDegree15 ...