Plastics Parallel Multifunction Drawing Measuring Rolling Ruler 30cm Can be used as a compass, horizontal ruler, straightedge, protractor, circle template and angle template Best for drawing-verticallines, parallellines, charts, angles, 3-D drawings, horizontal lines, circles, graphs, musical-note etc Functions as a compass, horizontal ruler, straightedge, protractor, circle template and angle template A multipurpose drawing instrument that lets you measure in inches and centimeter. Ideal for artists, drafting students, pattern-makers, and designers