HIGH QUALITY MATERIAL: 180 mm Combination Square is made of high quality aluminium alloy die-casting, which is good at resisting oxidation, corrosion and durability, unlike plastic which is easy to break. The scale on the body is clearer and more precise PRACTICAL AND DURABLE: The Aluminum Speed Square has the highest degree of accuracy. The rafter square layout tool has high-quality bevelled corners, a length of 180 mm and the Speed Square is only 3.4 mm thick MULTIFUNCTIONAL DESIGN: This rafter angle square is a great helper for woodworkers. All metric measuring tools can be used for length, width, 15 degree angles, 90 degree angles, 45 degree angles, depth, height and scribing PRECISE MEASUREMENTS: This set of tools simplifies your work by allowing you to measure and mark angles faster for efficient and accurate measurements. Ideal for multi-dimensional measurements, scribing, layouts and more, also ideal for professionals and DIY enthusiasts EASY TO USE: The aluminium square ruler can quickly measure or mark angles from 0 to 90 degrees with just a few simple operations, saving you a lot of time in your woodworking work, Manufacturer: Hang Zhou Great Star Industrial Co.,LTD