... . 2.Economic and practical, Gravity Roller ConveyorExamples of conveyed goods: Boxes, Light tools or machine parts, Books, Trays, Parcels, Books ... and appearance is beautiful.SpecificationsThe diameter of the roller have all kinds, see following:Roller conveyor dia: 25.4mm, 38.1mm, 50 ... loaded, female/ Male thread, full mortise.Capacity per roller: 40kgCapacity per meter: 400kg Gravity roller conveyor