Protractors are devices employed to measure angles.
This tool has many application fields. It can be used in office and technical design or in workshops. The latter are made by stronger material, usually stainless steel, in order to prevent that rust make difficult the reading or erase the scale.
Steel protractor are very useful and precise tools for setting grades, transferring corners, and many other applications. A protractor is composed by a graduated body (or base) and a blade that can be securely locked at any angle by means of the locking nut.