The Omnigrid mini square ruler set Includes one each of three square quilting rulers: the 2.5" square, the 4.5" square and the 6.5" square. Use the Omnigrid 2.5" square for miniatures and color wash quilts; it features a 1/8" grid. The Omnigrid 4.5" square also has a 1/8" grid; its extra 1/2" width for seam allowances is a great template for 4" blocks. The Omnigrid 6.5" square also has a 1/8" grid; it's a popular size for baby quilt blocks.Details:ClearSizes: 2.5" x 2.5", 4.5" x 4.5" and 6.5" x 6.5"Set of 3 square rulersHeavy-dutyDurable acrylic material for use with a rotary cutter or a straight-edge bladePatented double-sight lines that show up on light and dark fabricsDiagonal angle line and laser cut edges for smooth, deep cutting and edge markings for accurate measuringLeft and right hand numbering and angle system