Cutex Brand Pack of 30 SINGER Class 66 Sewing Machine Plastic Bobbin #172336 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 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, 833, 834, 844, 935U, 968, 1022, 1247, 1263, 1280, 1288, 1482, 1485, 1486, 1488, 1490, 1492, 1802, 1803, 1812, 1852, 1853, 1862, 1872, 1873, 2102, 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, 9034, 9044, 9110, 9130, 9134, 9210, 9240, 9323, 9334, 9408, 9410, 9416, 9420, 9423, 9430, 9432, 9444, 9500, 9502, 9505, 9518, 9600, 9602, 9605, 9606, 9608, 9610, 9612, 9614, 9618, 9802-9836, 9936, 4622, 57817, 57820, 57825, 93220, 93234, CG500, CG550, CG590, CM17, CP17, DL17, DX14, DX-14C, FM17, FM19, FM22, HD102, HD102, HD110