The Omnigrid marking ruler trio contains 3 rulers that can be used to quickly and accurately perform a variety of marking tasks when quilting. They come in different lengths, but all 3 have center lines exactly 1/4" from both edges of the rulers, providing an excellent reference line for marking 1/4" sewing lines, adding and checking 1/4" seam allowances and marking 1/4" quilting lines.Details:Yellow and clearAvailable in sizes 4", 6" and 12"1/4" allowancesAvailable in different sizesContains 3 rulers