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 and bias pieces when quilting; it is particularly handy for secondary cutting after cutting strips, and it can also be used to cut fat quarters into strips and shapes.