Profile: Clayton's Mercantile Supply, Inc. offers new & used pallet racks and steel shelves. We also distribute a full line of packaging and material handling supplies. We deliver and install new & used pallet racks within the tightest of time lines. We have a large inventory of used pallet racks such as 20′ X 34″ teardrop style, 18′ x 44″ used Frazier pallet rack and 96″ used Frazier pallet rack beams. Our steel shelving units are available in 15″ x 36″, 30″ x 42″, 32″ x 42″, 24″ x 36″ and 24″ x 48″ sizes.