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The Cortex Hidden Fastening System is the fastest, easiest way to hide the heads of your deck screws on most leading brands of deck board types. Simple and easy to use, just set the screw, set the plug, and you’re all set. Cortex offers a strong face mount connection between the deck board and joist. It hides fasteners across the entire deck, first and last board, perimeter, and stairs.We cary Cortex for the following brands. Azex - Timbertech - Trex - Evergrain and Cortex They are available in a 100 square foot package and a 300 square foot package. All screws, plugs, and setting tools are included in every box.