Use the horizontal, vertical, and diagonal markings to square up any block, up to a 14.5" square. Use these lines to center and trim embroidery designs, applique blocks, and even fussy cut T-Shirts for T-Shirt quilts. (Fussy cutting is choosing a specific design in the fabric to showcase in your project.)
The drilled holes at 1-1/2 to 11-1/2 inch increments, make it possible to square up, mark and add the seam allowance to any block. To fussy cut, center a fabric design in the printed black solid squares.