Features: High precise aluminum alloy multifunctional triangles square for accurate 90° and 45° measurements in woodworking and engineering applications. Features double scale, thickened antislip design for scratch resistant precise measuring in woodworking tool and engineering projects. Essential measuring tool for carpentry, DIY enthusiasts, and engineers working with pipe, 3D workpieces, or square timber layouts. Ideal for marking angles on circular material during furniture assembly, pipe installations, or architectural blueprints verification tasks. Combines protractors functionality with multiple angles calibration capabilities in aluminum construction, streamlining measurement workflows for professional accuracy. Specifications: Component:aluminium alloy Size:Approx.110x80x5mm/4.33x3.14x0.19inch Color:Blue/Red Package Includes: 1pcs Triangular Ruler note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you donot mind befores you order. 2.Due to the differences between different monitors, the picture may not reflect the actual coloring of the item. Thanks for your understandings.