【Durable ABS Material】The protractor is made of high quality ABS material, which is sturdy and durable, resistant to friction and has a long service life. In addition, the disc and centimeter scale are equipped with a spirit level, which allows you to easily grip the scale. When the bubbles are in the middle, it means horizontal balance. 【Two Scale Rulers】The protractor is designed to help you easily measure the correct and accurate bevel angle. It has two different scales in inches and centimeters, which can provide you with the exact angle (inside or outside) you need for a perfect cut. It is very convenient. 【Accurate Measurement and Reading】The O-ring of the protractor can ensure smooth and precise operation, obtain accurate inside and outside angle readings, and avoid incorrect measurements during the beveling process. In addition, the protractor supports any angle measurement from 0 to 360°, which gives you exactly the angle you need. 【Easy to use】The protractor has an engraved