This plastic bobbin cover plate is used as a replacement for part #416428301 Made of durable plastic, this see-through cover allows you to keep an eye on your bobbin thread, helping to ensure you don't run out in the middle of a project. Can be installed and removed easily using the release button on your machine. As a helpful little tool, printed on the bottom corner of the plate is a guide on feeding your bobbin thread so you no longer have to wonder how to do it. Fits Singer - 3321 Talent, 3323 Talent, 44S Heavy Duty, 4411 Heavy Duty, 4423 Heavy Duty, 4432 Heavy Duty, 4443 Heavy Duty, 4452 Heavy Duty, 5511 Scholastic, 5523 Scholastic, 5532 Heavy Duty, 5554 Heavy Duty, 6380 Heavy Duty, 85SCH