Staedtler 551 Comfort Compass Set with Extension Bar This exceptionally high-quality compass set comes fitted with a spring-bow head and centre wheel, easily adjustable hinged leg joint and needle shoe, as well as an interchangeable lead part and shouldered needle. The set includes the compass itself, a universal adapter and a spares box with a hinged lid. It is compatible with technical pens, and the maximum circle you can produce (when using the extension bar) is approximately a generous 500mm. - Brand: Staedtler - Length: 154mm - Number of pieces: Set contains compass, universal adapter and spares box - Working range: Approximately 500mm max diameter (when using extension bar)