The Quilter's Magic Wand is an accurate 1/2" wide ruler with an etched line running down the middle. That etched line guarantees you will have a perfect 1/4" on either side. It's excellent for half-square triangles, garment sewing, and more. Use it for marking or measuring when high precision is required. The Quilter's Magic Wand is 1/2" wide by 12" long.