Each of the bone plates is preferably made of biocompatible materials, such as titanium or titanium alloys, and stainless steels, or made of bioabsorbable materials, or made of a polymer, such as the polymer known as PEEK. In one embodiment, the plate is formed from anodized titanium. 77As can be seen in FIGS. 4 and 53-55, the screw head 26 includes a drive recess 300.