SINGER Buttonholer Sewing Machine Attachment - Untested The SINGER Buttonholer Sewing Machine Attachment is designed specifically for Singer machines, making it a compatible accessory for those looking to enhance their sewing capabilities. The buttonholer attachment allows for easy creation of perfectly sized and shaped buttonholes, adding a professional touch to any sewing project. With the trusted SINGER brand name, this attachment is a reliable tool for any seamstress or crafter looking to expand their skills and produce high-quality results.