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. "The Workhorse" is 16.5" squared and handles larger blocks, and scrapbook album pages. Great for squaring pieced blocks, borders, and is used as a pillow template or for square designs such as Diamond in the Square or Shoo Fly. The easy to read number and grid lines with 1” grids and 1/8” increments ensure precise measurements. For right-and left-handed use. Available in 10 sizes to accommodate all your crafting needs; no matter the project, we’ve got you covered.