Material: the ruler body is made of steel and the corner frame is made of aluminum alloy, which is durable and has a long service life Special Specifications of the kit: ruler measuring range 0-300mm, angle frame height 115mm, with protractor, center point measuring instrument and needle pointer. scribe Precise scale: laser scale on the ruler surface, numbers and scales are clear, 2mm thickened ruler body, no easy to use carry Versatile ruler: the corner frame is equipped with It has an automatic adjustment nut, which can adjust and measure at any time. will. It also has the functions of protractor, center point measuring instrument and level indicator Widely used: professional measuring tools, suitable for measuring angle, length, the center of the measuring circle, the standard angle of 45° , etc