Simpson Strong-Tie #9 x 2-1/2 in. Hex Drive, Hex Head, Strong-Drive SD Wood Screw (2000-Pack)Simpson Strong Tie #9 x 2 1 2 in. Hex Head SD Wood Screw 2000 Pack Experience unmatched strength and reliability with Simpson Strong Tie's #9 x 2 1 2 inch SD Wood Screws. These screws are the only approved fasteners for Simpson Strong Tie connectors, offering superior load values over traditional nails. Ideal for both interior and exterior projects, these screws are mechanically galvanized to withstand even the toughest environments. Key Features: