Corrugated Cardboard Circular Knives, offerring a full line of tungsten carbide razor blades for each corrugated cardboard cutter machin type, such as BHS, FOSBER, TCY, FULI, JUSTU, JS, K&H etc. Application: Tungsten Carbide Knives / Blades are used for cutting paper, cardboard, corrugated cardboard. Cemented Carbide Knives and HSS Circular Knives. With the suitable grinding wheels to maintain the long using time.