Omnigrid Rectangle Ruler Value PackRuler Gift Set (1x6", 4x8" & 6x12") The Omnigrid rectangular ruler set includes one each of three rectangular quilting rulers: 1" x 6", 4" x 8" and 6" x 12" rulers. Use the Omnigrid 1" x 6" to check seam allowances, trim foundation piecing, and mark hems and seam allowances. The Omnigrid 4" x 8" rectangle also has a 1 8" grid; making it excellent for miniature quilts and for scrapbooking. The Omnigrid 6" x 12" rectangle is used to cut strips, shapes