Check out our Threads: Our patented thread serration technology allows the corrosion-resistant 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 Heat Treated Grade 5 Durability: Stay Stronger for Longer Subjecting the PowerLag screw to heat treating gives greater strength and reduces breakage The washer head screw is tested under the toughest scenarios to give you confidence in every connection Lag Screw: Options And more Options Offers the largest selection of code recognized structural wood to wood engineered fasteners in the industry T-Star Screw: ICC-ES building code recognized for use in structural wood to wood applications ICC-ES Report ESR-1782 Manufactured to Imperial size standards with industry leading pull-through and withdrawal values T-Star drive accepts and is compatible with all industry standard bits Our 6-Lobe design provides superior bit engagement Better bit engagement means quicker installation with less effort