The Singer Buttonholer Attachment W654321N is a vintage sewing item designed for Singer sewing machines. It is a unit that helps in creating perfectly centered buttonholes by guiding the button through the fabric. The attachment comes with a case for easy storage and organization and original instruction booklet, making it convenient for both beginners and experienced seamstresses. With its compatibility with Singer machines and its specific function as a buttonholer, this vintage sewing item is a practical and reliable addition to any sewing and/or Singer collection.