GRK RSS structural screws are engineered as a direct replacement for lag screws and bolts, eliminating the need for pre-drilling. The W-Cut thread design, CEE thread, and Zip-Tip work together for fast, easy installation into wood.

• 5/16" diameter x 4" length
• Self-tapping - no pre-drilling required
• W-Cut thread design reduces installation torque
• CEE thread and Zip-Tip for fast material penetration
• Climatek coating for corrosion resistance
• Round washer head with milled cutting pockets for clean countersinking
• Reduced shank diameter minimizes wood splitting
• Star drive head - use T30 bit
• 25 screws per box

Application: Use in place of lag screws for deck framing, ledger board attachment, structural connections, and heavy-duty wood-to-wood fastening.