The 2 Ft. Shelf Industrial Storage Rack Extension Kit includes dense wire grid shelving, safety straps with weld nuts, locking shelf pins, grid clips, and glass-filled nylon top caps. The kit is made out of heavy-duty steel and rugged reinforced nylon. The uprights, straps, hardware, and crossbeams all feature a durable powder-coated finish that resists chipping or fading. Use the stacking plates to add an additional 2 ft. of height and another shelf to the rack. This shelf supports up to 2,500 lbs. of weight.