Self-drilling screws are manufactured for use in wood, fiberglass and metal

They possess a drill point which enables the screw to drill its own hole in thin gauge steel; no pre-drilled holes are necessary

The sharp threads create their own mating thread when drilled into the material, and provide a stronger grip to your surface

for roofing construction, these screws have a neoprene washer that provides a water-tight seal, and prevents corrosion between surfaces

Zinc

100-piece per package