Features:Brand new and high quality 0~180 degree rotation protractor ruler for easy and precise measurement.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. 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. Specifications:Condition: 100% Brand NewMaterial: Stainless SteelColor: As Picture ShownSize: Approx. 19.7*5.2cm/7.76*2.05inWeight: Approx. 70g Package Included:1 *Protractor Ruler 2-in-1 Design: the combination of ruler and protractor makes it can measure length (0-10 cm) by fixed ruler, semicircular protractor at the top can measure from 0-180 degrees left to right and right to left. Precision tool: protractor and ruler of angle measure tool are precision laser etching, the readings are clear and accurate, easy to read, durable and convenient for your use. Quality material: angle finder protractor is made of quality stainless steel, with well durability and wear resistance, not easy to rust, and can be applied for a long time, but notice that the peaked stainless steel border, please be cautious while using. Adjustable protractor arm: angle is quickly and easily identified by knurling thumb nut locking in the desired position, you can fix the angle to plot, suitable for setting bevels, draw radial lines, measuring and marking angles. Wide usages: round head protractor is suitable for engineering, angle measurement, student drawing, architectural design, carpentry, length measurement, ideal gift for students, craftsmen, architects and designers.