O'Lipfa 12-1/2-Inch-by-12-1/2-Inch Ruler
The O'Lipfa Quilting Rulers are the perfect tool for quilters. With this 12.5 inch sq. ruler you can also make perfect cuts at 60 and 45 degree angles.  Also features large inch numbers and 1/8, 1/4, and 1/2 inch markings.  Made in USA.