Deck Plus hex lag bolts are a grade 2 bolt, perfect for exterior wood projects. The black color lends a low profile that blends in well with surroundings and matches the latest trends in hardware. This bolt has a duplex coating that is 2X more corrosion resistant than galvanized fasteners and provides 4 layers of protection from sun, rain, snow, and chemicals. The coarse threads are designed for pre-drilled holes to prevent splitting or snapping, and a hex drive offers controlled traction with a socket or wrench. Use this bolt with washers of the same diameter, material, and finish for best results.