... Japan and Germany 4)wear resistant,prevent rust,no burr Bottom hole with angle upper slotter blade :1):Hardness:HRC 61-622 ... paper ,carton or depends on the customer's requestService typeOEM,ODM etc.8)Advantages: Bottom hole with angle upper slotter blade are suitable ... cardboard ,box/carton industries reduce cutting cost andimprove cutting quality. Bottom hole with angle upper slotter blade