The three rulers are available in 3 sizes (10, 20, 30cm / 4, 8, 12 inches), which can meet your daily and professional use. High quality stainless steel ruler, quality not easy to wear, strong and durable and not easy to damage. Precise ruler with inch scale on one side and metric scale on the other side, which can help you better calculate the object you need to measure. When you need a measuring tool when studying or working, you only need to use this ruler on the measuring object to get accurate measurement data. The ruler is widely used by engineers, students, artists, designers, teachers and architects. It is a good tool to have in your daily life.