Magnetic Seam Guide, Dritz 626

Use the Dritz Magnetic Seam Guide on the metallic throat plate of your sewing machine to get equal seam widths on fabrics. This flexible seam guide can be adjusted to any width to get straight seams. You can easily line up this magnetic guide against any fabric and start sewing.

NOTE: there is a disclaimer on the package that says that this product is not recommended for "computerized sewing machines." Many sources have claimed that the magnet in this is not strong enough to affect the machine. If in doubt, contact your machine's dealer/manufacturer.

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Youtube demonstration of this tool:
https://www.youtube.com/watch?v=jnVBtdd4AdI