Square Ruler Value Pack (2-1/2", 4-1/2", 6-1/2")The Omnigrid mini square ruler set includes one each of three square quilting rulers: the 2 1 2" square, the 4 1 2" square and the 6 1 2" square. Use the Omnigrid 2 1 2" square for miniatures and color wash quilts; it features a 1 8" grid. The Omnigrid 4 1 2" square also has a 1 8" grid; its extra 1 2" width for seam allowances is a great template for 4" blocks. The Omnigrid 6 1 2" square also has a 1 8" grid; it's a popular size for baby quilt