50-1 Roller chain: 1, Material: 40Mn 2, Color: Blue 3,Standard: ANSI, ... kind of chain has many models. 50-1 Roller chain with 2 attachments' specification:1, Plate material: 40Mn; Pin: 40Cr; Bush ... available.3, Technics: It is made by advanced heat treatment with competitive price.4, Standard: ANSI, GB, ISO, DIN5, ... box + wooden case6, Delivery time: 50 days 50-1 roller chain with 2 attachments