Radius Markers are used for scribing circles up to 80" (200cm) in diameter. All are of a folding type design. The mini and small models will fit conveniently into a shirt pocket. All have sturdy friction joints to maintain rigidity and accuracy and are manufactured from lightweight, rustproof aluminium for durability and a long working life. The holders will accommodate round, square or flat soapstone crayons, pencils or steel point scribes.