1.made with 9CrSi,D2,HSS, M2, 440b, 440c, etc 2.tolerance within 0.002mm 3.OEM for customer 4.more than 20 years experience Product introduction: professional production precision article points round blade, mainly used for metal plate, strip points production line, the cutting tool materials of high speed cutting tool steel material stability LD H13 SKD SKH and other materials, a set of perfect ...