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, in a length of 12 inches/ 30 cmMore 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 useMultiple uses: whether you are an artist, student, pattern maker or designer, this measuring rolling ruler is a good helper for your work or study; It can help students develop their own manual skills as well as their imagination to draw different design picturesQuality material: our measuring ruler tool is made of transparent plastic; It is light-weighted, easy to carry; Transparent material allows you to draw without ignoring some important figures or wordsPackage includes: 2 pieces measuring rolling ruler, 2 rulers can let you keep one in school or office, and another ruler at home in case you need it