Cortex Hidden Fasteners For Composite Timbertech/Azek Cortex For Composite Decking uses plugs cut from the same deck boards as the one's you're installing. Made by Fastenmaster for Timbertech/Azek, the Cortex Hidden Fastening System is one of the fastest, & easiest ways to hide deck screws. Includes 2 TTAP Bits. Timbertech/Azek Cortex For Composite: Available In Antique Leather, Ashwood, Dark Roast, Dark Teak, Driftwood, Espresso, Maritime Gray, Mocha, Pecan, Reclaimed Chestnut, Tigerwood, & Whitewash Cedar 100 Linear Foot Box Includes 224 Screws, 300 Plugs, & 2 Bits Plugs Cut From Timbertech Composite Deck Boards #8 x 2-1/2" Carbon Steel Screws ACQ Approved Cortex Plugs Will Not Work With Terrain, Prime, Or Prime+ Deck Boards 25 Year Limited Warranty Cortex Installation Instructions