OMNIGRID 1" x 6" General Rulers. OMNIGRID rulers are the nomber leading quilting rulers in the world. They are preferred by professional quilters and by teachers around the world. They are guaranteed to be longer than others. They are the only ruler to ensure accuracy +/- .002 inches. OMNIGRIDs patented and protected (black and yellow) double sight line ensure easy reading and measurement on light and dark fabrics. Markings make it easy to use right and left hand. OMNIGRID rulers have grid patterns. These rulers are made from durable, high quality laser cut acrylic for a smooth edge. Designed and manufactured in the USA.Ê