Screw, tool and arrangement with a screw and a tool

The screw as claimed in at least one of the preceding claims, characterized in that, when viewed parallel to the center longitudinal axis (26), in all protuberances (24;

• 84) a tangent or parallel line to the leading side surface (28;
• 58) of the protuberance (24;
• 84) in the screwing-in direction encloses an angle (δ) of between 25 degrees and 50 degrees, in particular 35 degrees, with a radial direction which runs through the point of the protuberance (24;
• 84) located furthest from the outside in the radial direction.

A tool (40;

• 90) for screwing in and unscrewing a screw as claimed in at least one of the preceding claims, with a drive formation (48;
• 98) which is configured to match the drive formation (18;
• 78) of the screw, characterized in that the drive formation (48;
• 98) has a depression or a projection, wherein the depression or the projection in each case has a circular-cylindrical or frustoconical main body arranged concentrically with respect to a center longitudinal axis (26) of the tool (40;
• 90), and a number of protuberances (24) which extend away from the main body (22), wherein the protuberances (24) are of rounded configuration at their radially outer ends, wherein relative to the center longitudinal axis (26) the protuberances (24) extend with a radial component with respect to the center longitudinal axis (26) and with a component which is oriented tangentially and counter to the screwing-in direction.