GRK Fasteners RSS Series 12221 Rugged Structural Screw, 5/16 in Thread, T-30

Easy to install lag alternative. Zero stripping recessed star drive. Cee thread for a clean finished look. W-Cut for low torque; smoother drive. ZIP-TIP for no pre-drilling; faster penetration. Washer head provides immense holding power. Cutting pockets provide a clean hole, reduces splitting, and bore with precision. ESR-3201 Approved for structural application. Climatek Coated: AC257 code approved for use in treated lumber. For interior/exterior use in: carrying beams, ledger boards, stair rails, deck posts, playground equipment and other professional applications.