... /A3 2.pitch:31.750mm 3.plate thickness:4.00mm A series 100 chain used for Industry 1.material:40MN/A32 ... anti-fatigue8.sound quality,reasonable price and prompt delivery are what we persue9.Packing:1pc packing in PP bag,white inner ... . O-Ring Motorcycle chains: 428SO,520SO,525SO,530SO3. Roller chains: A series and B series4. Silent chains: SC3,SC4,SC5,SC6 ...