This binding foot (clip-on) is used to bind pre-folded bias binding tape or bias tape you have to cut yourself to the edge of fabric in one easy step. It is equipped with a small funnel to fold and guide the binding over the fabric edge before it reaches the needle and can be used with either zigzag or decorative stitches as well as straight stitch.  Make sure you have the clip-on shank adapter or ankle on your machine.  Item No. 6290.