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