Roller Chain 1.Quality standard:ISO9001 certificate 2.Material:steel,20Mn2, Q235, Alloy 3.Modle:simplex,duplex,triplex Roller Chain1).Quality standard:ISO9001 certificate2 ... sprockets and machinery transmission parts.Main products include chains,sprockets, timing belt pulleys, gears, bushes & hubs, pulleys, and others.We can ... ability to make special items according to customer's design. Roller Chain