The single "wing" blade on the side of the Wing Needlet cuts a narrow hole in your fabric, allowing you to create the popular heirloom-style decorative hemstitching.,,Best for: Decorative stitching on tightly woven fabrics such as lines and fine batiste.,,Use with fine cotton, rayon, or polyester embroidery threads.,,With a unique curved design at the clearance-above-the-eye "CAE" stress point distributes pressure equally which makes Klasse needles much stronger then other flat conventional needles.