Creative Grids CGR9 9 1/2" Square Quilt Ruler - Easy to read black and white markings printed in 1" grids marked in 1/8" and 1/4" increments. The 1/4" dashed lines printed on two adjoining sides aid in trimming seam allowances. Use lines to square up blocks based on four-patches, embroidered, and appliques blocks. A 45 degree diagonal line makes trimming half-square triangle blocks easy and accurate.