pc 30cm Rolling Parallel Ruler Professional Parallel Roller Ruler Multipurpose Scale Drawing Ruler Protractor

Dimensions: 31.5 x 6.5 x 2.1 cm 【Versatile Rolling Ruler】 Easily draw horizontal and vertical parallel lines. Draw circles up to 28 cm in diameter. Draw angles with the built-in protractor. Draw curves, arcs, and other geometric shapes. 【Drawing Roller Ruler】 Built-in roller for smooth gliding, stable drawing, and no tendency to tilt. Parallel scales, various formulas, and conversion factors are printed on the roller for easy reference at any time. 【Transparent Scale Ruler】 The ruler's printed black scale is clear and easy to read. Marked in both metric and imperial units. The transparent design allows you to draw without overlooking important graphics or text. 【Material and Care】 Made of impact-resistant plastic, lightweight, portable, convenient, and durable. Note: This rolling ruler is only suitable for use on surfaces with relatively high friction, such as drawing paper and canvas, and is not suitable for use on very smooth surfaces. [Widely Used] Whether you are an artist, student, designer, or architect, this parallel drawing ruler is a great aid for your work or studies. It can help students develop their surveying and mapping skills and their spatial imagination to meet various needs.