OLFA, Non-Slip, Frosted Advantage™ Acrylic Rulers are not your ordinary rulers! OLFA’s rulers are non-slip for stable and safe cutting and frosted with black grid lines for clarity on light- and dark-material. This 12.5" squared is the popular ruler used for all quilting and crafting projects. Great for squaring pieced blocks, cutting larger pieces, and works well as a template for pillow tops and simple square patchwork designs. The easy to read number and grid lines with 1” grids and 1/8” increments ensure precise measurements. For right-and left-handed use.