Features 2-in-1 Design: the combination of ruler and protractor by fixed ruler by moving 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 Application: round head protractor is suitable for engineering, angle measurement, student drawing, architectural design, carpentry, length measurement, ideal gift for students, craftsmen, architects and designers Specification: Material: Stainless Steel Measurement Range: 0-180°, 0-15cm / 0-5.91in Optional Size: 80 * 120mm / 3.14 * 4.72in, 120 * 150mm / 4.72 * 5.91in, 150 * 200mm / 5.91 * 7.87in Weight: 50-129g Package list: 1 * Protractor Ruler Package List