Built-in Locking Device The aluminum alloy woodworking T ruler is a built-in locking device, making the measurement and marking more accurate. The film is easy to read and move for horizontal, vertical, long lines, short, parallel and right angles. Bring you a new and different sense of use. 45, 90, depth, width, drawing lines: the 90 shape holds it firmly in place, while with two selecting surfaces, you can mark and measure the top, edge and corners at the same time! There are even two vertical scales along the precision lines of the drawing at the edge of your work. Application: woodworking T ruler is suitable for workshop, DIY, toolbox, home crafts, modeller, carpenter, cabinet maker and woodworker, etc. Regulations for aluminium alloy: this woodworking T ruler is made of high-quality aluminium alloy materials with good resistance to corrosion and oxidation, anti-protection, stable quality and long service life. Package list: 1 x woodworking rule; Length: approx. 11.8 inches / 30 cm; precision: 0.05 mm; but: angle measurement, drawing and marking multifunctional line.