Abstract: A hand device is provided with two individual pairs of surfaces, each of which includes a guide surface and a dressing surface of a tool. In that arrangement the second guide surface is wider by a multiple than the first guide surface and the second dressing surface. As the width of the first dressing surface is preferably variable, a surface strip portion out of which a contact member can preferably be displaced extends at a uniform distance relative to the first guide surface, so that the overall width approximately corresponds to that of the second guide surface.The holder is of L-shaped cross-section and the tool which is provided with cutting edges on both sides projects beyond the second limb portion of the holder and forms both dressing surfaces. The tool is fixed by a clamping effect which is provided exclusively centrally, so that it can flex in its lengthwise direction on both sides.