Rolling Ruler Plastic Parallel Rolling Ruler, Multifunctional Drawing Design Ruler for Measuring Drafting Student School and Office, 12 Inch (1)
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Wide applications: versatile measuring ruler, with a protractor to draw the desired figure, can also draw arc curve, horizontal parallel line, vertical parallel line, enough size for drawing
More details: each centimeter has a circle hole for drawing circles and ellipses; This drawing ruler is built in roller, clear scale, easy sliding, stable drawing, not easy to skew, clear scale, easy to observe; There are various formulas on the roller, which can be calculated quickly in use