Patent ID: 6918727

Claim:
An anchoring screw comprising: a) a first bolt section having an external thread formed on an exterior thereof; b) a second bolt section having first, second, and third screw threads equally spaced on an exterior periphery thereof, each of the screw threads having a different thread height, wherein the height of the first screw thread is greater than the height of the second screw thread, and the height of the second threw thread is greater than the height of the third screw thread, the third screw thread being located adjacent the free end of the second bolt section; and c) a tool driven section located between the first bolt section and the second bolt section, wherein the tool driven section is a polygonal flange located adjacent to an end of the first, the second and the third screw threads on a first tool driven section end and located adjacent to an end of the external thread of the first bolt section on a second tool driven section end.