ALVIN Rolling Parallel Ruler 12 Inch Model 312 Multipurpose Imperial and Metric Rolling Ruler for Students Artists and Designers Ideal for Drawing Parallel Lines Curves and Arcs 12 inches

A multi-purpose drawing tool made from high impact plastic for students, artists, and designers. Graduated in both English and metric. Includes many useful formulas and conversion factors. Draw horizontal and vertical parallel lines with ease. Draw circles, curves, or arcs. Use the built-in protractor to draw angles. Blister-carded, instructions on back.