Lori Holt designed her Seams Sew Easy for an accurate 0.25" seam and for constructing easy corner triangles. This tool saves time by not having to mark lines on your fabric when sewing half square triangles, flying geese or snowballs. The center circle of the guide is also marked with 0.5" grid lines for a wider seam allowance. These grid lines also help to ensure correct placement when adhering to your sewing machine bed. This seam guide also includes a strip of temporary adhesive dots to affix the guide to the bed of your sewing machine.