Cortex Hidden Fastening System Set Tool for Deck and Trim - 2 Pack is the fastest way to hide fasteners in composite, capstock, and PVC decking boards. It has a Drive System pattern that is almost impossible to strip-out. In addition, the stability button keeps the fastener straight through the installation creating a strong bond. The new thread design reduces installation torque and increases the fasteners strength. The tool has been optimized for extreme pro contractor use.