Acu-Arc Adjustable Ruler   Draws curves of any radius from 6.75 to 200" or Metric from 17cm. to 500cm. Why buy a costly set of rigid curves when one instrument will do the job better? With the adjustable Acu-Arc Ruler, you can draw large curves or arcs in just seconds! Made of a stronger new plastic material and with improved accuracy.     Unit Price $43.50