Sturdy ABS material The protractor is made of high quality ABS material, which is durable, friction-resistant and has a long service life. In addition, the disc and the centimeter scale are equipped with a spirit level, which facilitates control of the scale. When the bulb is in the center, it indicates horizontal balance. Two ScalesThe protractor is designed to help you easily measure correct and accurate bevel angles. It has two different scales in inches and centimeters to provide the precise angle (internal or external) needed for a cut perfect. Its very useful. Precise Measurement and ReadingThe protractor O-ring can ensure smooth and precise operation, get accurate readings of internal and external angles, and avoid measurement errors during the beveling process. Moreover, the Protractor supports any angle measurement from 0-360, giving you the exact angle you need. Easy to UseWith an engraved dial and two easy-to-read scales, the protractor is easy to use and carry, and features a unique one-handed clamping mechanism. Simply set the saw to the angle read on the protractor. Wide range of applicationsProtractor The angle error of the protractor is extremely small, the precision is high, and the measuring arm can rotate freely without dead angle. It is perfect for carpenters, plumbers, households and all construction industries that need to measure and convert angles.