High Quality - This woodworking ruler is made of stainless steel, very rust-resistant, durable and not easy to break. With the precision digital scale ruler, users can easily read and use the digital on the ruler.Adjustable Nut - The nut allows you to adjust the nut to loosen or tighten the protractor to get the desired angle. It can be used for setting chamfers, measuring, drawing radial lines, etc. Double arm - This ruler has two functions: one is a fixed ruler for measuring length (10 inches or 250 mm), the 39;other is a movable ruler to measure the length from 0 to 30 cm. A sturdy ruler with a protractor can measure between 0 and 180 degrees.Widely Used - This protractor is suitable for student drawing, machinist, carpenter and joiner, vehicle maintenance, repair, to construction, architecture, etc. 100% Satisfied Service - Enjoy a smooth and frustration-free experience with our 100% Satisfied Service in one month!