-Small -Available in four sizes for scribing circles up to 80" diameter -Folding type design - three smaller models will fit conveniently into a shirt pocket -All have sturdy friction joints to maintain rigidity and accuracy -Made from lightweight, rustproof aluminum for long wear -Soapstone crayon installed in each radius marker -Scribe holder will accept round, square or flat soapstone crayon, pencil or steel point scribe -Measuring Range: 20"Models available small size for scribing circles up to 8" diameterSturdy friction joints maintain rigidity and accuracy, and are made from lightweight, rustproof aluminum for long wearSoapstone crayon is included. The scribe holder will accept round, square or flat soap stone crayon, pencil or steel point scribeFolding type design - three smallest models will fit conveniently into a shirt pocket