What components make up a combination square?

A combination square is an essential tool used in various measurement and layout tasks, especially in the fields of woodworking and metalworking. The core components of a combination square include a steel rule and an accurately machined head. The head is typically adjustable and can have multiple features, such as a right-angle or 45-degree angle, as well as a level and sometimes a protractor.

The accuracy of the machined head is critical, as it allows for the precise alignment and measurement when creating square corners or measuring angles. This combination of features enables the user to make accurate measurements and check angles efficiently in various applications. Therefore, identifying the accurate machined head paired with a steel rule clarifies the functionality and versatility of the combination square in practical use.