With frame angle, triangle, miter angle and protractor angle, this measuring tool can also be used as a scriber and saw blade guide. The lip can be used for safe positioning. The aluminum alloy triangle ruler is made of high-quality aluminum alloy, with excellent workmanship, high hardness, not easy to rust and corrode; strong and durable, moderate toughness, no deformation, and more durable when dropped. The coating is rich and uniform, flat and smooth, which is better than other coating processes. High-precision rafter square ruler, with one 90 angle and two 45 angles, right-angle base, easy to fix, can help you measure the size well; easy to draw lines and smooth to use. There is a conversion table on the back, common rafter conversions. Lightweight and sturdy, more convenient for your work. The speed square metric is designed for construction and renovation projects, and is also suitable for hobbyists, carpenters, house builders, engineers, DIY enthusiasts and handicraft artists