For Singer models 66, 400, 500, 800 series, 935U, 1021, 1022, 1247, 1263, 1280, 1288, 1730, 1862, 2100 series, 2210, 2430, 2440, 2500 and 2600 series, 2700 series, 2950, 30920, 3102, 3103, 3270, 4538, 4610, 4830, 4832, 5017, 5028, 5040, 5050, 5417, 5430, 57817, 57820, 57825, 5805, 5808, 5812, 5814, 5816, 5818, 5825, 5830, 5838, 5910, 6012, 6100 series, 6201, 6202, 6211, 6212, 6214, 6215, 6233, 7004, 7028, 7033, 7100 series, 7211, 7212, 8220, 8734, 8834, 9005, 9008, 9010, 9015, 9018, 9020, 9027, 9030, 9032, 9034, 9044, 9110, 9130, 9210, 93220, 9323, 93234, 9334, 9410, 9420, 9416, 9420, 9430, 9432, 9444, 9500, 9600, 9800 series, CG500, CG550, CG590, original blue tinted bobbin