... . Coal,iron ore,port etc. idlerFree roller,Tapered roller,Grooved roller,Sprocket roller,Drive taper roller,Accumulating roller etc.Roller DiaShaftDiaTube ThicknessRoller LengthTube structureSurface treatmentErecting structureΦ16 ... -1500Φ800Φ10010.0,12.0200-1500 production line conveyor system and roller idler