... lathe, hobbing, high frequency quenching,4. Material: C45, A3, cast iron, stainless steel5. Surface treatment: Oxide black, galvanization, nickelizing, ... and South America, Europe, Oceania, Middle Ease, AfricaMaterialC45,A3, cast iron, stainless steel, copper etcManufacturing methodweleded or forgedHeat treatmentHigh frequency ... 76,32B9-76 PackingPlastic bag+plywood case/Pallet sprocket chain