... ISO9001:2008 Detailed Production Description(16B-2) durable duplex roller chains &chain manufacturer B series1)material : 40mn2)pitch : 25. ... their heavy series products(19.05-44.45mm pitches)2)motorcycle chains :428,428H,530,530H,630,630H3 ... chain attachments:A-1,A-2.K-1,K-2,SA-1,SA-2,SK-A,SK-24)double ... interested in our products.Pls send us the qty, material, size, packing, logo design and so on.Your ...