High Quality Material: This protractor angle is made of stainless steel, very rust-resistant, durable, not easy to break. With the precision digital scale ruler, users can easily read the digital on the ruler and use it. 2-in-1 Design: The combination of a ruler and a a protractor enables it to measure the length (0-10cm/0-3.94in) by fixed ruler and measure the length (0-30cm/0-11.81in) by moving the ruler, the protractor semi -circular at the top can measure from 0 to 180 degrees from left to right and right to left. Precision Tool: The protractor ruler adopts metric scale and can be used to measure the angle and the length. Graduations on base and ruler are precision laser etched then black filled for long life and easy readability. The arrow on the ruler indicates that the reading angle is more accurate and faster. Easy to Use: With the nut, you can adjust the nut to loosen or fix the protractor to get the angle you need. It can be used for setting bevels, measuring, drawing radial