Hillman Self-Drilling Sheet Metal Screw Washer Head Neoprene

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. Self-drilling screws designed for power driving wood or metal to metal Drill point drills its own hole, taps mating threads and fastens firmly in one operation Steel backed neoprene washer for water proofing Zinc finish for moderate corrosion protection No need to pre-drill a hole