A combination square is a multi-purpose measuring and marking tool used in metalworking, woodworking, and stonemasonry. ... The most common head is the standard head, which is used as a square for marking and testing 90° and 45° angles.
A combination square is a multi-purpose measuring and marking tool used in metalworking, woodworking, and stonemasonry. ... The most common head is the standard head, which is used as a square for marking and testing 90° and 45° angles.