Package Includes: Come with 1 pack plastic drafting 12 inch/ 30 cm t-square ruler which has a convenient hanging hole. Material: The ruler is made of high-quality materials, a certain degree of flexibility, durable and can be used for a long time. With a durable ruler, you don't have to buy the ruler again in a short time. Double-Sided Scale: This scale has inch and centimeter calibration, with a centimeter scale on one side and an inch scale on the other side. So, it is helpful and bring you great convenience for your drawing and measuring. Transparent Ruler: Made of transparent plastic, you can see the underline notes, convenient for you to draw columns or check the layout of your paperwork. Wide Applications: Suitable for engineers, architects, students, draftsmen, artists, etc. It will be a good assistant for your work and study., Weight: 0.05952481074 pounds, Manufacturer: WAenZeeNHWZZ