... PP,PA,PVC,HDPE,BOPP,metal or stretch film and others.Blades are designed for slitting procees in film,foil, ... for a variety of high-hardness ferrous metal grooving and cutting process,including tool steel,die steel,bearing steel,refractory ... assembly line----automatic sharpening assembly line.Production fast,the blades are sharp and durable. tungsten steel small circle saw blade for paper and fiber