Twin needles are used for practical sewing and decorative sewing such as pintucks, seam finishes and topstitching etc. The spacing of the needle is measured in mm from tip to tip (2mm needle has a 2mm space between the points). Two needles are attached to a single crossbar, stitching two rows simultaneously to create decorative effects for heirloom sewing, pintucks, fancy hems, and other decorative topstitching.