Drywall screws, or Sheetrock screws, are specialized screws designed for use in installing drywall, also known as gypsum board or plasterboard. They are typically made of hardened steel with a sharp, self-tapping point and a bugle head that is designed to sit flush with the surface of the drywall. Drywall screws are available in various lengths and thicknesses, depending on the size and thickness of the drywall being installed. Dry wall screws are often coated with a phosphate or zinc plating to prevent rust and corrosion. They are typically used to attach drywall to wall studs or metal framing, as well as to attach corner bead and other drywall accessories.