... ~90T, 28B 9T~76T, 32B 9T~76T7. Standard dimensiong for hub, height, diameter8. Processing: forging hobbing, quenching. CNC machine9. ... , Europe, Oceania, Middle Ease, AfricaMaterialC45,A3, cast iron, stainless steel, copper etcManufacturing methodweleded or forgedHeat treatmentHigh frequency quenchingSurface treatmentOxide black ... ,28B9-76,32B9-76 PackingPlastic bag+plywood case/Pallet sprocket chain