12 inch acrylic ruler, 1/4" thick, used to help stitch along a perfect curve. Great for double wedding ring designs. (for use with a 1/4" longarm hopping foot) This ruler is a special Linda Taylor design. This template is a great help with double wedding ring or any other curved design. It will help you to stay along any curve. Use it with the Cross Hatch circles for great curved cross hatching. A wonderful must-have for any quilter!