Prym 611655 Omnigrid Patchwork Squares are every crafter's trusted companion. An essential tool for patchwork, dressmaking, and tailoring, these transparent rulers with black and yellow grid markings allow you to work on all types and colors of fabric. Each ruler is made from scratch-resistant plastic with hard-wearing resilience to preserve the grid lines and ensure their longevity. This square ruler simplifies the cutting of a variety of rectangular, triangular, or square shapes with perfect precision. It is safe to use with a hobby knife or a rotary cutter. This ruler measures 20 x 20 cm.