Check the listing for details. Roller Conveyor - 107" x 9-1/2" x 2-1/8" - Flow Rack - Material Handling,. Condition: Used. Listed at 121.77 USD. Roller Conveyor - Flow Rack. Designed to be used for sloped shelves, they rely on gravity to move totes or boxes from the loading side to the picking side. They can be reused in warehouses, parts storage areas, or even repurposed for DIY material handling projects.