Abstract: The invention relates to a bone screw comprising a first end having an engagement contour, wherein the engagement contour is arranged for engagement with a tool for inserting or removing the bone screw, and a second end which is situated opposite the first end and on which a blocking element is arranged, wherein the blocking element is provided with a circumferential outside surface which comprises at least one clamping surface which—when viewed in an azimuth plane perpendicular to a longitudinal axis of the bone screw—widens outwardly in a wedge-shaped manner away from the longitudinal axis. The invention also pertains to surgical sets including at least one bone screw and at least one bone plate.