Timber-Tite Screws - Heavy Duty Timber Landscape Screw Stronger than a HT Bolt Suitable for structural use in indoor or outdoor applications Net-Coat® green resists corrosion effects of pressure treated timbers Clamps fast with a flush fix, allowing the fixture of fascia boards Does not split the timber Does not require a pilot hole (in most instances) DeckMark Plus accredited Countersunk TX Drive Torx 30 Timber-Tite has achieved DarkMark Plus status. DeckMark Plus is a quality scheme operated by the Timber Decking and Cladding Association (TDCA). The TDCA are a technical and advisory body that operates on a not-for-profit basis. They provide decking advice and guidance on correctly specifying and installing timber decking and timber decking care and maintenance.