The Bernina Presser Foot 16 is used for gathering and ruffling fabric. The gathering is produced because the sole doesn’t rest evenly on the feed-dog causing uneven fabric feed. This allows one piece of fabric to be gathered while it is being attached to another layer of fabric, meaning a ruffle can be made and attached in one single operation. The amount of gathering is easily adjusted by varying stitch length and needle thread tension. For heavier fabrics, use long stitch or basting stitch for gathering. The distance between rows of gathering can range from a minimum of 3/16″ (5mm) to a maximum of 3/8″ (10mm).