Deck-Tite Plus Screws - Decking Screws - Stainless Steel Deck-Tite Plus is guaranteed to withstand any of the chemicals used in today's timber and hardwoods. It also offers total protection in the most extreme environments including; marine and polluted applications. In addition to superior corrosion resistance, Deck-Tite Plus' spiral point penetrates the timber surface without damage and its part thread prevents jacking. Square recess - each box comes with a free driver bit Countersunk Deck-Tite Plus is accredited by the Timber Decking & Cladding Association (TDCA) FOR BEST RESULTS USE AN IMPACT DRIVER Due to the nature of stainless steel - if driving without a pilot hole use an impact driver to reduce cam out Deck-Tite Plus has achieved DarkMark+ status. DeckMark+ is a quality scheme operated by the Timber Decking and Cladding Association (TDCA). The TDCA is a technical and advisory body that operates on a not for profit basis. It provides decking advice and guidance on correctly specifying and installing timber decking and timber decking care and maintenance.