Cap-Tor xd screws are specifically designed to provide a clean, smooth and uniform finish in PVC and composite decking. They also work equally well in traditional composites. Cap-Tor xd is approved for use with all major PVC and Composite deck brands.Cap-Tor xd screws feature extra deep star drive recesses, undercut heads, reverse threads, tri-lobular shanks, Type 17 auger tips, and are available with either a color matched, epoxy-based polymer resin coating or in color matched Headcote stainless steel (both Grades 305 and 316).