Easy to Read: You can adjust the tightness of the ruler with the nut to quickly and easily identify the angle. Rotating ruler makes angle reading more accurate and faster. Useful for setting bevels, drawing radial lines, measuring and marking angles. Two-in-One Design: Two-in-one stainless steel angle ruler, not only can accurately measure the angle in the range of 0-180, but also can quickly and easily measure length from 0-140mm. Accurate: The protractor has a metric scale and can be used to measure lengths. angles and lengths. The protractor is accurate to 0.1 degree and the ruler is accurate to 0.1 cm High Quality Material: The protractor is made of high quality stainless steel, which has a good durability and wear resistance, not easy to rust, and can be used for a long time. Please note the sharp stainless steel edges and use with care. Versatile Use: The round head protractor is suitable for engineering, angle measurement, student drawing, architectural design, carpentry. It is an ideal tool for students, craftsmen, architects and designers. Features: -Multi-angle measurement and drawing can be supported as required. -Stainless steel structure, rust and corrosion resistant. Specification: Material: stainless steel Ruler length: 140 cm Protractor range 0-180 Package includes: Protractor with ruler