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. Flat Head Screw: No required pre-drilling in wood. Be more efficient on the job by eliminating time consuming steps with self-drilling SPAX UNIQUE 4CUT POINT technology wood screw. T-Star Plus: T-star plus drive provides superior bit engagement. Better bit engagement means quicker installation with less effort. Welcome to the world of one-hand overhead driving. Countersunk Head Screw: Patented MULTIhead countersinks the screw head flush in wood. Keep a smooth surface on your project for greater design and functional qualities. Heat Treated Grade 5 Durability: Stay Stronger for Longer! Heat Treated Grade 5 Durability. Subjecting the screw to heat treating gives greater strength and reduces breakage. Tested under the toughest scenarios to give you confidence in every connection.