Hex Washer Head Self Drilling Screws
Zinc Plated Steel Hex Head TEK Screws
Self-drilling screws have a sheet metal thread with a self-driller cutting (TEK) point to pierce through 20 to 14 gauge metals. The higher the TEK number, the larger the drill point to pierce heavier gauge metals.
Hex Washer head self drillers in this selection are Zinc Plated Steel Fasteners, which adds a layer of corrosion resistance to the steel. Zinc can come in either a light shiny color or have a bright blue hue. Zinc plated steel is not suitable for extreme environment use, as it is not as resistant to corrosion as Stainless Steel.