... roller idler 1.Dia 89-219,length 190-3400 2.Used in mining,cement,steel,harbor,etc 3.Certificate:CE,ISO ... .Roller idlers Dia 50mm-219mm, length 190-3400mm, which are used in the steel industry, harbor, coal industry, power industry, cement ... ' requirements conveyor nylon roller, HDPE roller, PVC roller idler direct plant