Elevate Your Woodworking and Carpentry Projects: SPAX Finishing Trim Screws offer the perfect blend of precision, performance, and durability for both indoor and outdoor projects. From crown molding, baseboards, and window casings to door jambs and cabinetry, these versatile fasteners ensure a flush, clean finish that meets the highest standards of professionals and DIY enthusiasts alike. HCR (High Corrosion Resistance) coating are designed for use in both interior and exterior composite (PVC) connection applications. These finishing trim fasteners are designed to countersink for a clean-flush finish in both wood and composite materials. The double reverse thread is specifically designed for attaching composite (PVC) and pulling any shavings into the hole as it's tightened down. The double reverse threads also helps pull materials together and resist loosening from vibrations.