This OMNIGRIP square ruler is made for accurate cutting and squaring at the quilting or sewing cutting table. The clear acrylic ruler measures 20½" × 20½" (52.1 × 52.1 cm) and includes easy-read markings plus guides that support common triangle and seam-alignment work. Its larger footprint is helpful when checking big blocks and keeping edges aligned across wider fabric pieces, This supports cleaner joins and more predictable piecing.