paper cutting blade,perforating blade 1.Used for folding machine 2.Alloy steel. Paper cutting blade/perforating bladeperforating blade for folding machine.Materials can be selected alloy steel, ... Perforation knifeoutside diameter* inside diameter* thickness6,8,10,12,14,16,20,60,80. V-shapeU-shapeØ68mm*Ø45mm*0 ... customer's samples or sample map made to order . paper cutting blade,perforating blade