The OLFA QR-12S frosted acrylic square ruler is built for precise measuring and cutting in quilting, sewing, and crafting projects. It measures 12 1/2 in × 12 1/2 in (318 × 318 mm) to help square larger blocks, cut borders, and lay out patchwork with accurate grid references for right- or left-handed use. The frosted surface and black numbering stay readable on both light and dark fabrics for faster positioning.