All of the square rulers have the following standard Omnigrid® features: Diagonal angle line, Edge markings for accurate measuring, Laser cut edges for smooth, deep cutting, Patented double-sight lines that show up on light and dark fabrics, Heavy-duty durable acrylic material & Left- and right-hand numbering and angle system

Square up any finished block up to the size of ruler. The 1/2'' seam allowance is included on two sides, making it perfect for cutting background blocks.