STAEDTLER Mars Comfort 552 rapid adjustment compass. It features a fast adjustment mechanism with a button, a central adjustment wheel (Mitteltrieb), folding legs for parallel placement, and interchangeable 4 mm pencil and needle. Total length ~170 mm; typical maximum circle diameter approximately 350–360 mm (expandable to ~585–600 mm with extension nozzle). Typical surface: metal (nickel/chrome). The 552 01 packaging includes a folding case. The 552 02 variant includes an extension nozzle, universal adapter, and a needs box in a plastic case with a transparent lid.