Figure 14

A bronze bolt (clamp) in half size. With these devices, which also came in large sizes, they joined the carved blocks in the surfaces of which there had previously been made depressions in the form and size of the bolt.
  Figure 14a

Schematic drawing of a few if the many forms of the bolts, vestiges of which are found in the shape of depressions in the blocks supported in ancient times by these clamps or couplings which were used between them.