This multi ruler is a convenient and portable tool! When fully extended, it measures 30 cm (11.8 inches) long. However, when it's not in use it easily folds in half, thus becoming compact and easy to stow in a pencil case. The transparent body makes it easy to see lines and shapes underneath. Additionally, small holes are placed every 1 cm, making it convenient for you to mark important points in your work. This ruler also doubles as a protractor—the rotator circle has degree markings to measure angles, and the ruler arms stop in place every 15° when extending.