Omnigrid Marking Trio Ruler Se tThe 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 4in from both edges of the rulers, providing an excellent reference line for marking 1 4in sewing lines, adding and checking 1 4in seam allowances and marking 1 4in quilting lines. Package contains three convenient length rulers: 4in, 6in and