1、FINE WORKMANSHIP: Made of sturdy aluminum alloy after oxidation treatment, this saddle shaped layout ruler is durable, deformation resistant, practical, rust resistant, and corrosion resistant. 2、STANDARD SCALE: The metric scale and corner engraved by laser on both sides of the oblique cutting T ruler are clear and accurate, making it convenient and easy to read values or make marks during use. 3、EASY TO USE: When measuring, there is no need to reverse the body, just slide the mark to the left and right at an angle of 45 or 90 degrees. 4、SPECIFIC APPLICATION: When sliding the ruler along the hole bottom diameter at the edge of the triangle hole ruler, the set square can help you draw a perfect horizontal line. 5、EASY CARRYING: With a small size and a lightweight as well, this ruler set is easy to carry for different scenes use, use at will to help with your accuracy work!