Tool for drawing circumferences

A tool for drawing circumferences comprising a main plate having at least one through opening and at least one rotating plate located within the through opening of the main plate, both plates being contained in a common plane, the at least one rotating plate being rotatable around an axis normal to the common plane, the axis passing by the geometrical center of the rotating plate, the rotating plate having a plurality of through orifices located at different distances from a geometrical center of the rotating plate, each orifice forming a pass for a drawing point of a drawing device, the at least one rotating plate comprising at least one annular plate and a central disc plate, the rotating plate and the disc plate being concentrically located in the through opening of the main plate, the through opening of the main plate defining an inner edge of the main plate, the inner edge having first locking means for interengaging a peripheral groove formed in an outer peripheral edge of the annular plate, the annular plate having an inner edge with second locking means for interengaging a peripheral groove formed in an outer peripheral edge of the central disc plate, the first and the second locking means comprising respectively at least one radially resilient tongue formed in the inner edge of the respective through opening and annular plate by a radial cut and a circular cut adjacent to the respective inner edge, so that the tongue elastically yields along a substantially radial direction.