A combination square serves multiple purposes. A combination square is a tool used for multiple purposes in woodworking and metalworking. It is composed of a ruled blade and one or more interchangeable heads that may be affixed to it. The most common head is the standard or square head which is used to lay out or check right and 45° angles.
This short video shows Ray Horner Jr. explaining ways he used the combination ruler when building his custom canvas art.
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