They can have a plain or coated finish such as zinc, and can be hot-dipped and galvanized. Wood screws can have a flat, round, hex, oval, or pan head, and a Phillips, slotted, Phillips square, or Torx drive. They commonly have a pointed tip. Often beveled under the head, wood screws sit flush with the wood surface. They come in various sizes threads per inch or thread pitch and lengths in inch measurement, and can be used with washers.