Omnigrip Non-Slip Square Ruler Value Pack (6-1/2", 8-1/2", 10-1/2")The Omnigrip 10 1 2" Square Ruler set includes: 6 1 2", 8 1 2" and 10 1 2" rulers. These rulers have all the features of an Omnigrid ruler with a patented non slip backing for added stability. The fluorescent ink pigment enhances visibility in low light conditions. Highlighted precision markings allow for easy viewing on all colors and patterns. 45 diagonal lines help to center and align patterns while squaring up quilt blocks. Additional 1 2" seam