This OMNIGRID acrylic ruler supports precise measuring and trimming for quilting, sewing, and craft projects. Sized 15" × 15" (38.1 × 38.1 cm), it combines edge markings with the OMNIGRID double-sight line system so reference lines stay visible on light or dark fabrics. The larger square format helps when squaring up bigger blocks and verifying alignment before you join rows, borders, or on-point layouts.