EBayWide 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 cm, 6 inches/ 15 cm 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, pattern maker or designer, this measuring rolling ruler is a good helper for your work ; It can help you develop your manual skills as well as 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 Package includes: 2 pieces measuring rolling ruler, 2 rulers can let you keep one in office, and another ruler at home in case you need it Product description Use of protractor Align the center of the protractor on the edge of the ruler with the vertex of the surveying foot, and at the same time, coincide the scale of the protractor with the datum line, then various angles can be measured on the edge of the ruler. Multifunctional Rolling Ruler Insert the pen into the small hole at the ruler end to make the center of the circle, insert another pen into another hole and rotate the ruler body 360°to draw a circle. If the radius between the 2 holes is different or the rotation ruler body is different, different circles or arcs can be obtained. Multifunctional Rolling Ruler Press your hand on the ruler body, draw a horizontal line along the edge of the ruler, and then move the ruler up and down to draw a parallel line. Multifunctional Rolling Ruler Insert the pen into the small hole on the edge of the ruler, slide the ruler up and down to draw a vertical parallel line. The distance between the vertical lines can be measured directly. Use of protractor Arc and curve Horizontal parallel line Vertical parallel line