Solid & Durable MaterialMade of high-quality stainless steel, our protractor is rustproof, abrasion-resistant and corrosion-resistant with high hardness and strength. No need to worry about bending or breaking during measurement. Precise ReadingWith the smooth polished surface and the technology of laser etching, the marks and numbers on the round head protractor and ruler will not easily wear or fade for long time. The clear scales are clear and easy to read, helping you getting the date precisely and quickly. Adjustable AngleThe knurled thumb nut can be easily adjusted to rotate the protractor or ruler 180 degrees and lock the fixed angle to measure according to different requirements. Also, it can be used to detach the whole angle finder if you need to use them separately. Practical ToolOur angle gauge is a practical and indispensable tool for angle measurement, woodworking, drawing, architectural design, construction engineering and many other important fields, helping students, machinists, engineers and carpenters to complete the projects with high accuracy.