Safe-T Inch and Metric Calibrated Rule Compass (Includes Instructions)
Draw circles 1/4" to 10" in diameter in 1/16" radius increments Swing your circle holding pen or pencil point in radius hole for desired diameter Direct view of vertex points allows for easier and more accurate constructions Straight edge sides calibrated with inch/metric rules Complete instructions included Sold as Single Unit. Draw up to 10 inch diameter circles. No dangerous points. Instructions are included. Perfect for math and geometry class work.