Abstract of the disclosure A two-piece clamping element (10, 20) comprises two separate op posing first and second clamping jaws (12, 13) forming a later ally open cavity (11) to receive a rod-shaped element. Each clamping jaw (12, 13) has a bore aligned with one another to re ceive a screw, wherein a pivot bearing (17) is arranged opposite said cavity (11) allowing the two opposing clamping jaws (12, 13) to come in contact to one another. The pivot bearing (17) comprises at least one set of complementary bearing surfaces portions (36, 38). (FIG. 3)
