Henry F. Phillips commercialized the crosshead self-centering screw design that today bears his name. The Philips screw was first introduced by GM on its 1936 Cadillac assembly line and rapidly sweep through the U.S. auto industry. Today it is still the most popular screw design in use. This is a 4X macro photo of a very small precision Pozi Drive #0 Phillips bit. Notice the wear and grain in the stainless steel. Canon 40D, 1.3 sec @ f/16, ISO 800, 65mm MP-E macro lens.