140 duplex roller chain factory(28A-2R) 1.Factory price 2.Good quality with best delivery 3.OEM welcome 4.ISO9001: ... )and their heavy series products(19.05-44.45mm pitches)2)motorcycle chains :428,428H,530,530H,630,630H3)short pitch ... conveyor roller chain attachments:A-1,A-2.K-1,K-2,SA-1,SA-2,SK-A,SK-24)double pitch transmissions ...