Pack of 30 Singer Class 66 Sewing Machine Plastic Bobbins. Bobbin #172336. Bobbin measures 13/16" in diameter and 7/16" wide. They have a very slight dome shape on the sides, not flat. For Following Singer models : 66-6, 241, 247, 247AP, 249, 252, 263, 288, 328K, 348, 413K13, 417, 457, 502, 503, 503A, 507, 509, 513, 514, 518, 522, 527, 533, 534, 538, 543, 547, 560, 563, 588, 714, 717 School, 719, 724, 734, 774, 776, 800, 2105, 2106, 2108, 2110, 2112, 2114, 2118, 2210, 2302, 2303, 2304, 2315, 2330, 2404, 2430, 2440, 2502, 2503, 2504, 2505, 2515, 2517, 2530, 2543, 2628, 2732, 2818, 2950, 3100, 3101, 3102, 3103, 3105, 3130, 3140, 3270, 3314, 3317, 3343, 4325, 4522, 4525, 4526, 4528, 4530, 4538, 4552, 4562, 4572, 4610, 4620, 4622, 4825, 4828, 4830, 4832, 5017, 5028, 5040, 5050, 5417, 5430, 5605, 5610, 5705, 5710, 57815, 5802, 5805, 5806, 5808, 5810, 5812, 5814, 5816, 5817, 5818, 5820, 5825, 5830, 5838, 5910, 5932, 6011, 6012, 6021, 6038, 6102, 6104, 6105, 6106, 6110, 6120, 6130, 6136, 6146, 6152, 6156, 6174, 6184, 6201, 6202, 6211, 6212, 6214, 6215, 6217, 6221, 6233, 6234, 6513, 6522, 6528, 6533, 6543, 6544, 6548, 6606, 6610, 6620, 6705, 6700 Series, 7004, 7015, 7021, 7025, 7028, 7033, 7035, 7101, 7102, 7104, 7105, 7106, 7108, 7110, 7136, 7174, 7211, 7212, 8002, 8007, 8019, 8100, 8200, 8220, 8500, 8600, 8734, 8774, 9005, 9008, 9010, 9015, 9018, 9020, 9022, 9027, 9030, 9032, 93234, CG500, CG550, CG590, CM17, CP17, DL17, DX14, DX-14C, FM17, FM19, FM22, HD102, HD102, HD110 We stock many types of bobbins & bobbin cases for sewing machines. Even if you don't find the one you are looking for, it does