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The Cortex Fascia Hidden Fastening System is the strongest easiest way to hide fasteners in Trex Fascia Boards. Cortex for Fascia is engineered for fascia expansion/contraction and plugs are made from Trex fascia board making for a perfect color match. The TORX ttap Drive System is almost impossible to strip-out with the patented stability button that keeps the fastener straight throughout the installation.The Cortex for Fascia is available in a 50 lineal foot complete kit that includes 100 1-3/4′ screws 105 plugs 1 counterbore tool and 1 setting tool. The 1-3/4screws feature a #20 TORX ttap drive system making it easier to drive tools in a vertical application. The counterbore bit drills an oversized pilot hole for the screw and a hole for the plug all at the perfect height. The cortex fascia plugs are made from Trex fascia boards. With an exact color and texture match the system creates a smooth finished look.FastenMaster recommends using 3 fasteners every 18OC for 12fascia boards and 2 fasteners every 18OC for 8fascia boards. It is recommended to consult the manufacturer installation instructions prior to installation.