This circle is a 1/4" template used to guide a longarm machine to stitch smooth curves. The light blue color helps make the etched lines easy to see on any fabric. It has a notched circle to be used to help guide the long arm hopping foot if desired. This is just an extra way to stabilize the foot when going around appliqué. It is not to be used when stitching circles. It has curved etched lines to help with placement to stitch curved crosshatching. It has straight etched lines 1/4" spacing to help with placement. It has etched lines to mark the 4 quarters. All of these lines are useful in quilting various designs.