Alvin Rolling Parallel Ruler

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Alvin Rolling Parallel Ruler "A multi-purpose drawing tool made from high impact plastic for students, artists, and designers. Graduated in both English and metric. Includes many u seful 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." Show more