BERNINA #05 Blindstitch Foot
This foot is the invisible-hemming expert. When you sew a blind-hem with this foot, the stitching can scarcely be seen from the front because the stitch is formed over a special blade that acts as a guide, creating a slightly looser stitch so that the hem lies nice and flat.
When the fabric is pressed flat, the needle-penetration points on the front of the fabric “close up”, making the seam virtually invisible. The guide blade ensures an even distance to the folded edge, allowing the hem to be sewn neatly and consistently.