The Dual Feed Foot with changeable presser feet is designed to feed layers of fabric and/or batting evenly. It is perfect for quilting, sewing velvet, stretch fabrics, imitation leathers and fabrics need precise pattern matching. Snap on the Changeable Straight Stitch Foot. Select the center needle straight stitch. Adjust it up to a maximum stitch length of 6. Snap on the Changeable Zigzag Foot and select stitches up to a maximum of 7mm wide and 6mm and long.