Creative Grids 9-1/2in Square It Up or Fussy Cut Square Quilt Ruler
Use the horizontal, vertical, and diagonal markings to square up any block up to an 9-1/2 inch 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.)