Made of premium stainless steel, it is durable, lightweight, and easy to carry. The adjustable protractor arm can be locked in the desired position with a knurled thumb nut, allowing for quick and easy identification of angles, and adjustments can be made if the screw is too tight or too loose before using the ruler. The protractor is a common shape of protractor, universal, and can be applied to frequently solve mathematical problems. Suitable for angle measurement, architectural design, student drafting, engineering, woodworking, and length measurement. Also a suitable gift for students, craftsmen, architects, and designers. Description This angle measuring protractor can be applied to home and office use, as well as for school students and teachers. It is very convenient to use, good for getting work done, and also a great gift for children. Moreover, it is an essential tool for any toolbox. The black numbers are clear and easy to identify, allowing for quick and accurate reading. Features - Color: Silver. - Material: Stainless steel. - Size: 20.00X9.00X0.20 cm / 7.86X3.54X0.08 inches. - Made of high-quality stainless steel, it is very light and easy to carry. - The protractor is a common shape of protractor, universal, and can be applied to frequently solve mathematical problems. 180-degree rotating stainless steel gauge arm measurement double arm 30-41