Hillman 561050 Screw, 1/4-14 Thread, 1 in L, Washer Head, Hex Drive, Self-Drilling Point, Steel, Zinc-Plated, 100 PK

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 and 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. Perfect for roofing construction, these screws have a neoprene washer that provides a watertight seal and prevents corrosion between surfaces.