Balaustron compass with fixed rods and micrometric adjustment via center wheel. Mine clamps tighten securely, allowing precise lines to be drawn. The Compass is an indispensable item for familiarizing yourself with Geometry and Technical Drawing and for constructing complex geometric figures. Contains: 1 Compass, 1 Extension, 1 case with spare leads and ink pen graft. Perfect for Technical Drawing at School, at Home or at Work.