The Unique Creativ Magnetic Seam Guide helps you sew straighter, more consistent seams. Its strong magnet attaches to the metal throat plate and adjusts to common allowances for piecing or topstitching. Position the guide for 1/4″ quilts, 1/2″ seams and more, then follow the edge for uniform results across long seams or curves. Note: Do not use on computerized sewing machines. Ideal for beginners learning accuracy and for experienced sewists who want repeatable results.