Description Measuring tool has adjustable protractor arm that can be held in place with the knurled locking nut, quickly and easily identify angles. Widely used in industry, angle measurement, architectural design, carpentry, length measurement, and so on. Features - Color: Silver. - Material: Stainless Steel. - Size: 20.00X9.00X0.20 cm/ 7.86X3.54X0.08 inch. - The protractors is made of stainless steel material, it is not easy to rust, smooth edge, fine grinding, accurate measurement. - The ruler and protractor makes it can measure length by fixed ruler and measure length by moving ruler. - Semicircular protractor at the upper can measure from 0-180 degrees left to right and right to left. - Swing arm protractor read centimetre and read angle marker, then adjust the nut, you can fix the angle. - Suitable for engineering, angle measurement, student drawing, architectural design, carpentry, length measurement. The protractors is made of stainless steel material, it is not easy to rust, smooth edge, fine grinding, accurate measurement. The ruler and protractor makes it can measure length by fixed ruler and measure length by moving ruler. Semicircular protractor at the upper can measure from 0-180 degrees left to right and right to left. Swing arm protractor read centimetre and read angle marker, then adjust the nut, you can fix the angle. Suitable for engineering, angle measurement, student drawing, architectural design, carpentry, length measurement.