Calling all Singer sewing machine owners! If you've got a Singer Stylist 500 series machine that's making funny noises or having timing issues, these replacement hook drive gears might be exactly what you need. This 4-piece set includes everything required to replace the two feed gears and two hook gears in your machine - specifically the 383273 large feed shaft gear, 174488 long feed drive gear, 163997 hook drive gear, and 103361 hook gear. Now, here's the cool part - these gears fit a ton of Singer models including the 502, 507, 509, 513, 514, 518, 522, 527, 533, 534, 538, 543, 560, 800, 860, and probably others in the 500 series family. The gears might come in either black or white color, but don't worry - the function is what matters most! If you've been dealing with skipping stitches, timing problems, or grinding noises, worn gears are often the culprit, especially in older machines. Replacing these plastic gears with new ones can basically bring your vintage Singer back to life without the cost of a new machine. The installation does require some mechanical know-how, so if you're not comfortable taking apart your machine, you might want to consult a repair professional. But for those DIY-inclined sewers, this gear set can save you a ton of money compared to taking your machine to a repair shop. It's amazing how a few small plastic parts can make such a huge difference in your machine's performance. Whether you're keeping your grandmother's vintage Singer running or maintaining your own beloved machine, having the right replacement parts on hand means less downtime and more sewing time!