Head Screws -
Patented Multi-head design featuring ribs on the underside of the
head for a clean, flush penetration into wood, sheet metal,
masonry and plastics. These are coarse thread screws, made of
carbon steel, available in a silver zinc finish. Thread
serrations reduce the torque required to fully drive these
screws. For use with either a Phillips or Square Drive bit. Self
drilling/self tapping. Spax will only offer these in smaller retail packaging in 2021 with a higher cost per screw. Sale of these larger "contractor boxes" is limited to supply on hand. Engineered in Germany....made in USA.