... roller idle for the conveyor: 1.Dia: 60-219mm 2.used in mining ,coaling ,plant power, agriculture 3.pipe material : steel Detailed conveyor ... dia 60-219mm.length 190-3400mm,which are used in the steel industry,habor,coal industry, power industry,cement industry,etc.2 ... .Tube:steel tube Q235,seamless steel tube3.Shaft : 20mm/25mm/30mm4.Bearing: single/ ...