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