Feature●Heat Treated Grade 5 Durability: Stay Stronger for Longer! Subjecting the PowerLag screw to heat treating gives greater strength and reduces breakage. These wood screws are tested under the toughest scenarios to give you confidence in every connection.●Check out our Threads: Our patented thread serration technology allows the screw to be driven faster, easier to install, and reduces splitting in wood. Let the SPAX FACTOR take some of the hassle out of your next project.●Lag Screw: The ideal replacement for the conventional lag. ICC-ES building code recognized for use in structural wood to wood applications. Check out our ICC-ES Report ESR-1782●Options! And more Options!: SPAX offers the largest selection of code recognized structural wood to wood engineered fasteners in the industry.●Corrosion Resistant Screw: ICC recognized HCR coating makes these hex head screws ideal for use in treated lumber and exterior applications.Description 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 fathers traditional lag. SPAX PowerLag wood screws offer superior installation performance and durability over traditional lag screws and carriage bolts for structural wood construction. These corrosion resistant screws are made of carbon steel and coated for long term durability to ensure your project endures. U.S made SPAX is your trusted partner for your fastening needs. Bit included in the box. Do it Once, Do it Right with SPAX.