Durable material: Made of stainless steel, strong and durable, anti-corrosion, anti-rust, anti-drop and wear-resistant, smooth surface, easy to clean. GOOD DESIGN: designed with a button lock to lock the angle in any position.Fixed readings, screws can be tightened, easy to use, Easy to carry:Protractor 83mm x 282mm, disc diameter 160mm , can be carried with you or placed in a toolbox or backpack, easy to use at any time. High precision: The protractor can be rotated from 0 to 180 degrees, the scale on the ruler makes the data more clear, convenient and quick to measure the angle. < p>Scientific design: The ruler adopts single and double shank design to meet different measurement requirements. It is equipped with adjustment screws to adjust the angle. Wide application: Suitable for offices, schools and other occasions. Used in engineering, angle measurement, architectural design, woodworking, etc. The edge is smooth, the tilt angle, the measurement is accurate, the tilt angle is net, be careful when using Our service: We are committed to providing you with satisfactory service. If you have any questions, you can contact us at any time. We will reply to you within 24 hours and try our best to resolve the problem for you.