To use a steel square to lay out a diamond shape, start by marking a reference line on the material using the long arm of the square. Then, align the short arm of the square with the reference line and mark a point to the left and right of the reference line to create the width of the diamond. Next, rotate the square 45 degrees and align the short arm with the left point previously marked. Mark a point above and below the reference line to determine the height of the diamond. Repeat this step for the right point. Finally, connect the points to form the diamond shape.
