The Ultimate Thread Dispenser from WonderFil Specialty Threads greatly improves stitch quality and consistency by delivering the exact right amount of thread for every stitch, improving the stitch consistency and thread tension in your machine. The result is fewer thread breaks and a higher stitch quality, which makes all the difference when sewing with difficult threads! It fits all brands of domestic sewing machines and thread stands. The Ultimate Thread Dispenser will work on any vertical spool pin. (While not recommended for horizontal spool pin compartments, if your machine only has a horizontal spool pin, you can also use it on a thread stand.)