Geometric tool for precision work! Amazing, not just for its price, simply amazing. Pay attention to the metal semicircular sheet at the joint of the compass: It's not decorative! It acts like a spring and takes up the slack that the washer+bolt mechanism may develop over time. This means the compass is and will always be very sturdy, without any play in the radius we set. And I don't see many compasses with this characteristic! The pencil attachment allows us to use any pencil, marker, etc., as a writing tip instead of the basic graphite tip. Finally, the extension attachment comfortably allows us to draw circles with a diameter of 40 centimeters or a little more. The construction is made of solid aluminum in most places. And all of this for five euros and something!