The Quik Guard coated Deck-Drive DCU Composite screw is designed to resist medium levels of corrosion for all types of composite or PVC decking. The carbon-steel screw penetrates composite decking with a Type-17 point and is engineered with inverted upper threads that clear excess material to ensure a clean, secure installation. Available in 11 colors of Quik Guard coating that blend with popular manufacturers decking for a more concealed, professional finish.