Rafter square made of precise and CNC-machined aluminum alloy, which is light and convenient. Good oxidation resistance, not easy to break, each triangle ruler is thickened, corrosion-resistant and high hardness Permanent scale: With permanent engraved scales, gives you the over standard accuracy you need. The angle conversion table offers convenience of using the right number to work with. Frosted smooth surface, wear resistance, clear scale on the ruler surface, long service life Multi-function: Suitable for the measurement,rafter square can be used as a protractor, woodworking compass, triangle square and frame square. The horizontal base is convenient for marking, smooth and practical Convenient and comfortable design: rafter square is convenient to hang and store when not in use with humanized design. The edges and corners of each triangle are polished by special craftsmanship, so that it is smooth and does not hurt your hands Convenient to carry and store: 7-inch compact design, easy to carry and store, does not take up space, suitable for woodworking, DIY, construction and other purposes, Manufacturer: JTRRDDEW