... imported from Japan and Germany 4)low wearing,prevent rust,no burr Corrugated cardboard slotter machine knives :1):Hardness:HRC ... : Corrugated cardboard slotter machine knives are suitable for all kinds of corrugated cardboard cases,cardboardboxes and cartons. It has good ... materials neat,bright,clean,no burrand rough edges.Our knives are medium and high-grade products.They have long service life ...