Highlights: Wings on the shaft counterbore the hole, creating a channel for excess material and reducing upward pressure on the head of the screw. This prevents the screw from spinning out when fastening harder boards in cold or wet conditions The cap style head captures any mushrooming material, keeping it out of sight and ensuring a clean-looking installation The Quik Guard coating allows the screw to be used with certain preservative-treated wood substrates #9 Diameter #2 Undersized square drive-BIT2SU Cap head Sharp point Curved collation Quik Guard coating
From the Manufacturer
Quik Drive DCLG212S Composi-Lok (for Composite Decks) Gray Color 2 1/2-inch Deck and Dock Screws with Quik Guard Corrosion Protection. Sharp point with wire size #9 and #2 undersized square drive head (uses BIT2SU). Wings clear excess material in composite decks as Cap Head prevents -inchmushrooming-inch decking material. Used in Quik Drive tools; PRO250, PRO300S, 2000SDS. 1000 screws per box.