●Three Choices: 7.9 inches (20 cm), 11.8 inches (30 cm), 17.7 inches (45 cm) aluminum ruler, 1.4 inches (35 mm) wide ●(Easy to remove) Unique drawing, easy to remove ●Anti-slip Mechanism: Anti-slip mechanism that stops when pressed down ●【Heavy Duty】Made of anodized aluminum which is very sturdy. Also suitable for use with cutters ●Applications: Suitable for use in homes, schools, construction sites, and offices