【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 level, which makes it easy to grasp the scale. When the blisters are in the center, 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 the precise angle (internal or external) you need for a perfect cut. It is very practical. 【Accurate Measurement and Reading】The protractor's O-ring can ensure smooth and accurate operation, obtain accurate internal and external angle readings, and avoid incorrect measurements during the beveling process. In addition, the protractor supports any angle measurement from 0 to 360°, which can provide you with the exact angle you need. 【Easy to Use】The protractor has an engraved dial