Features: OOTDTY brand new and high quality. Wide Applications: Versatile measuring ruler, with a protractor to draw the desired figure, can also draw arc , 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. Multiple 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 pictures. Quality 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 words. Diff _x000D_ _x000D_