The OLFA QR-6S frosted acrylic square ruler supports accurate cutting and layout for quilting, sewing, and paper crafts, including patchwork blocks and templates. It measures 6 1/2 in × 6 1/2 in (165 × 165 mm) and the printed grid helps square blocks, align corners, and trim units to consistent sizes on a rotary mat. The frosted finish helps the black markings stand out on light and dark materials for quicker alignment.