... plant and mining machinery factory. Such as spur gear, bevel gear,sprial bevel gear,internal gear,sprocket,transmission,reducer,shaft and sleeve etc.material: 20CrMnTinormal ... :1shifting coefficient:0ProductsAll kinds of gears (spur gear, bevel gear, sprial gear, ring gear, internal gear, sprocket, chain wheel) transmission, gear box, reducer ,shaft and sleeve etc ...