Duplex roller chains for ANSI 60-3 1) material:40Mn 2) plate thickness:2.42mm 3) color:natural,black,blue ... ,yellow ANSI 60-23Aseries duplex roller chains(12A-3R)1) ... packing as your requirementMain products as the following1)roller chains: A series(12.7-50.8mm pitches ... ,520,530,630,25,25H3)short pitch conveyor roller chain attachments:A-1,A-2.K-1 ...