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. 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. Different Size: The ruler has different two sizes, which will full fill with your different needs. You can choose it base on your situations.