... Production Description(16B-2) durable duplex roller chains &chain manufacturer B series1)material : 40mn2)pitch : ... series products(19.05-44.45mm pitches)2)motorcycle chains :428,428H,530,530H,630,630H3)short pitch conveyor roller chain ... :2040,2050,2060,20805)leaf chains:LH series,AL series6)stainless steel roller chains7)simplex,double ... 16B-2) durable duplex roller chains &chain manufacturer B series