Elevate your sewing experience with the Sewing Machine Speed Controller, an indispensable accessory for Singer 4411 and 4423 Heavy Duty Quantum sewing machines. Enjoy unparalleled precision and control over your stitches, empowering you to explore a realm of creative possibilities. Its intuitive foot pedal design provides effortless speed adjustment, while its versatility and durability make it an essential tool for both home and professional workshops. Experience the exceptional value and quality of the speed controller, priced at an astonishingly low $4.50.