The Sew Straight Stitching Guide is so very help in sewing an accurate 1/4 inch! It allows you to guide your fabric along the 1/4 inch line at least 5 inches before it hits the needle. It stops you from fish-tailing your fabric as it approaches the needle as well. There are many other uses for this product in help with sewing connector corners and half square triangles.
It does not permanently attach to your sewing table and is removable for cleaning, etc. I can't sew without mine!