The Omnigrid Square Ruler Value Pack will make a great addition to your sewing and quilting supplies. This value pack contains four square quilting rulers measuring 4.5 inches, 6.5 inches, 9.5 inches and 12.5 inches, each having an extra 0.5 inches for seam allowances and diagonal angle lines. Cut, square and trim blocks with them. You can use them with a rotary cutter or straight-edge blade for the secondary cutting of strips and square-up finished quilt blocks. They also come with edge markings for accurate measuring. These rulers are made from heavy-duty, durable acrylic material with laser-cut edges for smooth and deep cutting.