... ,428,520,428H, 525, 530 etcMaterial:1045 steel, 1023 steel and 16MnSurface-finishing:Sandblasting, Dull polish, Galvanized, with the circle line ... requirement.Heat treatment:High frenquency quenching and CarburizationPackaging:Blister card, Slide blister, Poly bag, sprockets and chain set box or according to ...