This ruler set is basically calligraphy oriented. One can easily draw lines on on plain paper for accuracy in calligraphy/writing

• 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
• 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