Abstract: The present invention relates to a rotating shaping tool (1) designed to treat a surface of body extremities of mammals, in particular the nails or the skin of humans, which tool comprises an elongated shaft (2), one end (3) of which shaft can be clamped and the other end of which shaft has an operative section (4) with a rotationally symmetrical operative zone (5) which shapes the surface while abrasively removing parts of the surface and which projects beyond a shaft diameter, with the operative zone (5) on the end opposite to the shaft end (3) that is to be clamped being bounded by a rounded part (6) having a domelike structure (7) without the surface-shaping function that is inherent in the operative zone (5).