Alvin 312 Rolling Parallel Ruler， 12 Inch<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>High impact plastic</li><li>Graduated in both english and metric</li><li>Draw horizontal and vertical parallel lines with ease</li><li>Includes many useful formulas and conversion factors</li><li>Use the built-in protractor to draw angles</li></ul></div><img src="http://ecx.images-amazon.com/images/I/31q0fMbZH5L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31eYrKfVAyL.jpg" noproxy>