National Lumber Company

The FastenMaster Cortex Concealed Fastening System is the fastest, easiest way to conceal the heads of your deck screws on specific deck types. The finished look of the Cortex System is virtually invisible, so you can enjoy the attractive deck surface without seeing any screw heads. The Cortex screw offers the highest level of board-to-deck connection strength, while also creating a consistently cored hole for the plug connection.

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