Keeps your metal straight on the shear when cutting.
When material is cut on a metal shear, it can creep or move from the cutting force of the shear. A Tru-Square helps prevent this. When installed, it forms a right angle with the ruler and is parallel to the blades. As the material is cut, the cutting force pushes it into the Tru-Square. The material can't move, and creep is eliminated. The Tru-Square also serves as a front gauge and is an invaluable aide for making accurate, repetitive plaques.