Simpson Strong-Tie's Strong-Drive® SDWS T40 Washer-Head SawTooth® Point Structural Double-Barrier Coated Screws are coated with a proprietary double-barrier finish for enhanced corrosion resistance, making them ideal for treated lumber and exterior environments. The T40 6-lobe drive ensures maximum driver engagement and reduces cam-out, helping maintain installation efficiency and bit life. These screws meet rigorous code requirements and are ICC-ES ESR-3046 approved, offering professional-grade performance for contractors and builders seeking long-lasting, code-compliant fastening solutions.