GRK Black RSS (Rugged Structural Screw) Structural Screws are designed for secure wood-to-wood fastening in structural construction applications. Featuring a black finish for a clean, professional appearance, these screws are suitable for exposed wood connections where appearance matters. The 5-1/8" length provides extended reach for fastening thicker lumber, beams, posts, and framing members. Ideal for deck construction, timber framing, and other demanding building projects, these screws offer a practical fastening solution for structural wood assemblies. Follow the manufacturer's installation instructions for proper use.