Advantages: 1, High-quality 2, Long lifespan 3, Precision-machined 4, Professional manufacturer 1. 1st or 2nd synchrotron assembly for transit Transmission 1. countershaft 5th gear 2.material: alloy steel,carbon steel,stainless steel,tempered steel,cast iron,aluminum,copper,brass 3.OEM: 1st or 2nd synchrotron assembly transit Transmission .4. Professional manufacturer 5. provide OEM service 2. ...