The Quilt Ruler Upgrade Kit makes any standard 12" and 24" acrylic quilt rulers (1/8" thick) mistake-proof and slip-proof, whether you're left or right handed! It can also be used on 12-1/2" or 24-1/2" rulers.
Simply clip-on and slide the Fabric Guide to the line you want. This will catch the fabric's edge for perfect alignment and more accurate cutting. Attach Grip Strips to the edges of your ruler to keep it balanced.