Grip-Rite PrimeGuard Plus Self-Drilling Composite Deck Screws are designed for a lifetime of use in composite deck construction applications. Dual threads pull substrates together for a powerful hold and the T 17 self-drilling point pierces smoothly into PVC and composite materials. Trim undercut head seats cleanly for a flush or countersunk finish that won't mushroom and resists overdriving. Coated with PrimeGuard Plus these fasteners are backed by a lifetime warranty when installed correctly. Available in several colors, it's easy to find the right screw to match your project. Get the job done right with Grip-Rite!