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• The screwdriver's main purpose is to connect with and tighten or loosen fastening screws. Usually the design consists of a molded plastic handle and a thin metal shaft with a special head that fits each particular screw type. The two most widely used screwdrivers are the flathead and the Phillips head screwdrivers.

• Fast Facts

  1. Invention of the late Middle Ages
  2. Origin: Europe
  3. Early screwdriving innovator: Leonardo da Vinci
  4. Phillips screwdriver debut: 1934
  5. Phillips screwdriver inventor: Henry F. Phillips
  6. Phillips head screwdrivers fit with screws that have a crosshead design; that is, the screw's groove is shaped like a plus sign
  7. Flathead screwdrivers connect with screws that are simply slotted like a minus sign

• Other Popular Screwdriver Types

  1. Robertson (screw groove is square-shaped)
  2. Hex (screw groove is hexagonal)
  3. Torx (screw groove is star-shaped, as if two triangles were placed on top of one another)

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