Twin needles are specifically constructed to provide two rows of perfectly spaced stitching. They are used for top stitching, to make pintucks or to turn simple decorative stitches into designer details. Pintucks are a must for Heirloom Sewing. Use the 2.5/80 needle to make very medium size straight pintucks on nighties, lingerie and blouses. 2.5/80, 1 per card.