... welcome 4.ISO9001:2008 Detailed Production Description140 duplex roller chain factory(28A-2R)1)material : 40mn2)pitch:44.45mm3)plate thickness ... :5.4mm4)color : nature,black,blue,yellow5)factory price without middle man6)standard:ISO/ DIN /ANSI7)good quality ... their heavy series products(19.05-44.45mm pitches)2)motorcycle chains :428,428H,530,530H,630,630H3)short pitch conveyor ...