... 1.made with 9CrSi,D2,HSS, M2, 440b, 440c, etc 2.tolerance within 0.002mm 3.OEM for customer 4.more ... material stability LD H13 SKD SKH and other materials, a set of perfect vacuum heat treatment process, hardness even, precision processing manufacturing ... . Especially for all kinds of cold and hot rolling steel plate, XiGangPian and galvanized iron ...