High Quality Stainless Steel: Made of quality stainless steel, it is sturdy and corrosion-resistant, and can be used for a long time. Double-Sided Scale: The front and back display metric and imperial scales respectively, and the red scale is dotted between them, which is helpful for identification. Clear and easy to read, convenient for your measurement. 3 Different Sizes: The set contains 40cm, 30cm and 20cm, There is an additional 0.5mm precision scale in the front 10cm of the ruler, which increases the practicability. Practical: Each ruler is individually packaged and there is a hole at the end of the ruler, which is very convenient to carry and store. Wide Usage: Three different sizes of rulers can meet most of your needs, perfect for designers, costumers, modelers, carpenters, architects, students, teachers, DIY enthusiasts, craftsmen etc.