[6 Metric Scales]: There are 3 sides with 6 scales, 1:20, 1:25, 1:50, 1:75, 1:100, 1:150, clear to read and easy for your drawing. [Dimension]: Total Scale Length is 30cm/12inch and the overall ruler length is 32cm/12.5inch. [Multifunctional Scale Ruler]: This is a multifunctional scale ruler, can be used for measuring, professional drawing, decoration design, classroom and office purposes, convenient to use for many purposes. [Durable Material]: Made of high grade aluminum alloy, rust proof, light and not easily deformed. [Ideal Gift]: The ideal measurement tools for architects, draftsmen, engineers, teachers and students etc. Total Scale Length 30cm/12inch Total Length 32cm/12.5inch Color Black Material Aluminum Alloy Type Rulers C.