Pedicle screws with a closure device for receiving and securing a rod made up of a flexible plastic, for stabilization of a vertebral column. The pedicle screws include a screw-in part, a head part with a U-shaped recess formed by two arms and into which the rod to be held is insertable. The U-shaped recess is closable by a locking element. A clamping screw, put into the locking element, presses an insert on the rod and clamps the latter between a first clamping surface and a second clamping surface. The insert is provided with stop faces by which the clamping action against the rod, transmitted to the insert by the clamping screw during the clamping step, is limited. An optimal connection between rod and pedicle screw is thereby obtained.
