The package contains: you get one protractor, which has a clear metric measurement standard, the arrow on the ruler indicates that the reading angle is very accurate, enough for all construction and remodeling projects. Materials: the angle measuring ruler is made of high-quality stainless steel. The surface of the product is smooth, smooth, scratch-resistant, wear-resistant, rust-resistant and can be used for a long time. Unique design: the two-in-one stainless steel square ruler can not only accurately measure the angle within the range from 0 to 180, but also easily and quickly measure the length from 0 to 140 mm. Easy to use: the metal protractor can rotate the protractor 180 degrees by adjusting the nut, and can lock the ruler in a fixed angle at the desired position, so that the angle can be measured quickly and easily. Wide application: the protractor is an important tool in many areas and is often used in machines, crafts , building technology, construction and maintenance technology, etc. It can be used at home, in the office and at school.