UNEX Low Profile Gravity Flow Span Tracks are designed to install between all standard Pallet Rack Beams. Conveyor rollers rest on pallet rack step beams to create gravity flow shelving that maximizes inaccessible space, minimizes loading time and helps ensure stock rotation. These roller tracks feature 3/4" diameter aluminum rollers with a galvanized steel track frame. Rollers are spaced on 2¿ centers. 50 lbs./ft. load capacity. Required Hangers (sold seperately).