Quik Drive DCLG212S Composi-Lok Gray 2 1/2-Inch Deck and Dock Screws with Quik Guard Corrosion Protection Quik Guard proprietary double barrier corrosion protection Composite Deck to Wood Screw Cap Head prevents "mushrooming" Used in Quik Drive Tools PRO250, PRO300S, 2000 SDS. Free Bit in every box of screws #2 Undersized square drive BIT2SU