Alvin 312 12" Rolling Parallel Ruler

Alvin 12" rolling parallel ruler lets you measure in inches and centimeters and draw quadrants, squares, circles, angles, crosshatching, and vertical and horizontal parallel lines, quickly and easily. Functions as a compass, horizontal ruler, straightedge, protractor, circle template and angle template, all in one. Unique compass pivot button eliminates surface marking. Ideal for artists, students, pattern-makers, quilters, and designers. Includes instructions.