SPAX #6 x 5/8in. Pan Head Unidrive Zinc Coated Screw - 50 per Box Check out our Threads!! Our patented thread technology allows the 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. No required pre-drilling in wood. Be more efficient on the job by eliminating time consuming steps with self drilling SPAX. The pan heads clamping force is ideal for installing brackets or fixtures with a pre-punched hole. Heat Treated Grade 5 Durability. Subjecting the screw to heat treating gives greater strength and reduces breakage. Pan Head Construction screws provide excellent draw down and holding performance in multiple materials where a flush or countersunk installation is not possible or desired.