Replacing OEM numbers: 172222, which is a direct replacement for the old or broken one. Compatibility: This product is compatible with Singer Sewing Machines using the Class 66 Bobbin, and also compatible with Singer Models 185, 192, 192K, 192 Spartan, 201, 201-2, 240, 247, 249, 252, 263, 288, 401, 401A, 403, 403A, 404, 413, 416, 417, 457, 500, 500A, 502, 503, 503A, 507, 509, 513, 514, 518, 522, 527, 533, 534. Function: Holds the bobbin securely in position and maintains proper thread tension for smooth, even stitching performance. Easy Installation: Can be directly replaced without adjustment; perfect compatibility and high reliability. Product List:Product include a total of 20pcs Sewing Machine Bobbin , which can completely meet your daily use needs and replacement., Manufacturer: YINETTECH