Square Quilting Ruler - 12.5" is perfect for squaring up blocks. This Omnigrid ruler comes is 12.5" x 12.5" in size and is designed for left- or right-handed users for added convenience. It has laser cut, smooth edges that allow for deeper cutting of layers. This square has 30, 45, and 60 degree angle lines that are marked for easy alignment of materials. t is ideal for quilters, seamstresses, do-it-yourselfers and crafters.