... 1 chain with double attachment: 1, Material: 40Mn 2, Color: Blue 3,Standard: ANSI, GB, ISO, DIN 60-1 Roller chain with ... double attachment's specification:1, Plate material: 40Mn; Pin: 40Cr ... , Technics: It is made by advanced heat treatment with competitive price.4, Standard: ANSI, GB, ISO, ... case6, Delivery time: 50 days 60-1 roller chain with 1 attachment