SPAX 3581820801710 5/16 x 6-3/4" T-Star Washer Head HCR (High Corrosion Resistant) (Exterior) PowerLag Screw (250 Pieces per Pail) The SPAX Factor - For the craftsman that concentrates on the details, We Work for You. For the Pro that puts quality first, we help you create stronger connections, enhance performance and improve results when your reputation is on the line. Say goodbye to your father?s traditional lag. SPAX PowerLag Screws offer superior installation performance and durability over traditional lag screws and carriage bolts for structural wood construction. These T-star washer head screws are made of carbon steel and coated for long term durability to ensure your project endures. Item includes a bit in the pail. U.S made SPAX is your trusted partner for your fastening needs. Do it Once, Do it Right with SPAX. Features Check out our Threads: Our patented thread technology allows the washer head screw to be driven faster, is easier to install, and reduces splitting in wood. Let SPAX take some of the hassle out of your next project. Heat Treated Grade 5 Durability: Stay Stronger for Longer! Subjecting the PowerLag screw to heat treating gives greater strength and reduces breakage. Tested under the toughest scenarios to give you confidence in every connection. Options! And more Options: Offers the largest selection of code recognized structural wood to wood engineered fasteners in the industry. The item includes a bit in the pail. ICC-ES building code recognized for use in structural wood to wood applications. ICC-ES Report ESR-1783. Manufactured to imperial size standards leading pull-through and withdrawal values. Recommended for use in treated lumber and exterior applications T-star Screw: T-Star drive accepts and is compatible with all industry standard bits. Our 6-Lobe design corrosion resistant screw provides superior bit engagement. Better bit engagement means quicker installation with less effort. USA SHIPPING estimates delivery times and we work to get your item to you as quickly as possible and within those times, but please know it may take slightly longer than the estimate.