Tool attachment point with alignment aid for screw elements

A screw element for the fixation of bone components and bone fragments comprising a shaft with an outside screw thread and a longitudinal axis extending along the shaft and thereby defining a distal direction and a proximal direction, and an insertion direction and an opposite removal direction, and has a tool attachment point starting radially inwards and the tool attachment point has a central opening and in the wall of this opening at least five tooth profiles directed radially outwards and mainly parallel to the screw axis directed radially outwards and mainly parallel to the screw axis are formed in the wall of this opening, and for each tooth profile an insertion wall in insertion direction and a removal wall in removal direction can be separated, characterized in that the surface of the insertion wall is greater than the surface of the removal wall,

• wherein the tool attachment point is separable along the longitudinal axis into at least two sections, wherein a first section is formed coming from the distal direction and the surfaces of the insertion and removal walls of each tooth profile are approximately equal in size up to the height of a section parting plane, and
• wherein the tool attachment point is separable along the longitudinal direction into at least two sections and the insertion wall extends mainly parallel to the screw axis over the entire height of both sections.