The Type 305 stainless-steel Deck-Drive DCU Composite screw provides corrosion resistance for all types of composite and PVC decking, and is especially suited for applications in environments with chlorides. The DCU 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. The color-matching painted heads blend with popular manufacturers’ decking for a more concealed, professional finish.