Magnetic Seam Guide – Multi-Purpose Polygonal Strong Magnetic Gauge, Anti-Curling Positioner for Sewing MachineMagnetic Seam Guide Multi Purpose Polygonal Strong Magnetic Gauge & Anti Curling Positioner for Sewing Machine Straighter seams, every time. This magnetic seam guide is a simple but highly effective sewing accessory that attaches to your sewing machine with strong magnetic force no tools, no screws, no fuss. The polygonal design gives you multiple edge angles to guide your fabric at consistent seam widths, making it easy to sew perfectly straight,