Material: The ruler body is made of steel and the angle frame is made of aluminum alloy, which is durable and has a long service life. Kit Specifications: Ruler measurement range 0- 300mm, with protractor, center point measuring instrument, line drawing needle Accurate scale: laser scale on the ruler surface, clear digital scale, 2mm thick ruler body, not easy to wear Universal rule: The corner frame is equipped with an automatic adjusting nut, which can be adjusted and measured at will. It also has the functions of a protractor, a center point measuring instrument and a level. Wide range of uses: professional measuring tools, suitable for measuring angles, lengths , measurement circle centers, standard 45 angles, etc.