[High Quality] The aluminum alloy triangular rule is made of high quality aluminium alloy with excellent workmanship, high hardness and resistance to rust and corrosion; durable, moderate toughness, no deformation and more durable when dropped. The coating is rich and even, flat and smooth, superior to other coating processes. [Clear Scale] Roofing square 12 inch made with clear and accurate printing scale and high precision; can draw straight and wavy lines, both accurate and not easily worn. Available in metric and imperial sizes, with laser marking technology, it can be used well for angle measurement, the ruler base is exquisitely smooth and comfortable to the touch. [Horizontal Base] Highly accurate rafter square metric with one 90 angle and two 45 angles, right angle base, easy to fix, helps you to measure dimensions well; easy to draw lines and smooth to use. Conversion table on the back, common rafter conversion. Lightweight and sturdy, more convenient for your work. [Wide Range of Use] The metric speed square is used in woodworking production and decoration industry, DIY enthusiasts, etc.; it can also be widely used for design drawings, direct cutting, decoration design, angle measurement, hardware machinery measurement, and office use.