How to Use: 1.To stock the screw nut and then you could draw the angle you wanted. 2.Measuring angle to match the bottom of the half round and standard handle with the measured substance strongly. And then you could read the angle you measured very clearly. 3.Easily to measure any angle you wanted. Features: It's easy to use and read with clear markings. Made from premium stainless steel, it is durable and not easy to deform. Brand new and high quality 0~180 degree rotation protractor ruler for easy and precise measurement. To stock the screw nut and then you could draw the angle you wanted. Adjust the nut, you can fix the angle. Widely used in angle measurement, length measurement, student drawing, engineering, architectural design, carpentry and so on. Specifications: Condition: 100% Brand New Material: Stainless Steel Color: As Picture Shown Size: Approx. 19.7*5.2cm/7.76*2.05in Weight: Approx. 70g Package Included: 1 *Protractor Ruler Features: Made from premium stainless steel, it is durable and not easy to deform To stock the screw nut and then you could draw the angle you wanted. Adjust the nut, you can fix the angle It's easy to use and read with clear markings Widely used in angle measurement, length measurement, student drawing, engineering, architectural design, carpentry and so on