STAEDTLER 553 01 Mars Comfort Quick Setting Compass with Centre Wheel, Universal Adapter and Lead Box (360mm Diameter)

QUICK ADJUSTMENT: This precision mathematical geometry compass features an adjustment wheel and push-button mechanism – a reliable pair of compasses for maths that draws circles up to 360 mm in diameter with no slipping or readjusting required SECURE FIXING: The lockable drawing compass, with its locking screw and locking wheel, stays stable whilst drawing, thanks to the centre-drive spindle – delivering clean, accurate lines with no deviation in radius EXTENDED REACH: With the extension bar attached, the compass draws circles up to 560 mm in diameter; interchangeable replacement parts ensure long-lasting use both in school and the office COMPLETE SET: The Staedtler compass set includes a quick-adjust compass, a lead refill tin, and a universal adaptor, all neatly housed in a practical hinged-lid case – everything to hand whenever you need it DURABLE BUILD: Interchangeable compass leads with a 4 mm pin and a fold-away lead leg ensure a consistent line width and reliable results for years to come