Light Duty Roller Conveyors  have rollers that measure 1-3/8″ diameter and are 18 gauge galvanized steel or 18 gauge aluminum, with flanged type bearings and spring loaded 1/4″ wide axle.Industrial Conveyors VideoAluminum conveyors have 2-1/2″ x 1″ x 1/8″ aluminum channel frames, while steel ones have 2-1/2″x 1″ x 12 gauge galvanized frames.Channel capacity for steel conveyors is 900 lbs. and for aluminum, 600 lbs.Surcharge may apply.