Square up quilt blocks and prep precise cuts with this OMNIGRID square ruler, made for rotary-cutting workflows. The ruler measures 9.5 in x 9.5 in (24.1 cm x 24.1 cm) and includes built-in 1/2 in seam allowances on two sides for block trimming and triangle/border layouts. Use on a flat cutting surface and keep the acrylic clean and dry for clear markings and reliable alignment from project to project.