For sewing pintucks, youl need a double needle with a width between the two needles corresponding to the width of the grooves on the foot (up to 3mm). This way the finished tucks will be the matched in size to the grooves in the pintuck foot. When sewing several parallel pintucks, these grooves ensure an even distance between rows. The generous cutout in the center of 5-Groove pintuck foot # 31 ensures a good view of the area to be sewn.