50-1 Roller chain: 1, Material: 40Mn 2, Color: Blue 3,Standard: ANSI, GB, ISO, ... , This kind of chain has many models. 50-1 Roller chain with 2 attachments' specification:1, Plate material: 40Mn; Pin: 40Cr; Bush and ... chain + a poly bag + individual box + wooden case6, Delivery time: 50 days 50-1 roller chain with 2 attachments