1.Life more than 3Ys, with circulation repair use 2.After Vacuum Heat Treatment, HRC 60~63 3.Suface roughness overmatch Ra0.1 1.The material is SKD11,which import from Japan2.After Vacuum Heat Treatment, HRC 60~633.Suface roughness overmatch Ra0.14,Life more than 3Ys, with circulation repair use Wire drawing guide wheel (SKD11)