... mainly used for a variety of high-hardness ferrous metal grooving and cutting process,including tool steel,die steel,bearing steel,refractory steel,stainless steel,cast ... company uses the high quality import materials to produce the blade.The mainly materials are SK2,SK5,SK4,SK7,SKS7,SKS9 ... line.Production fast,the blades are sharp and durable. tungsten steel small circle saw blade for paper and fiber