Deck Supports by architrex are made of high-density copolymer polypropylene, containing 20% post-industrial recycled material and are impervious to water, mold .. In a variety of applications, these products are perfect for use with deck pavers or tiles. Adjustable Deck Supports are great where an ultra-low deck support is needed. Precise spacer tabs allow for deck drainage, and the screw-to-adjust height setting assures a perfectly straight and level deck. Quick clip couplers increase the speed and efficiency installing pedestals at heights over 9 -3/4 inches. Works with concrete or stone pavers, or wood tiles.