Plastic Drop-In Bobbins 36PCS+Box fit for Singer 66 Class, 99 Class, 200, 300, 400, 500, 700, 800 series and many more .The alternative part number are: 6965, 172222P, 172336-001, 4127597-61, 820363-096.The bobbin is curved (not flat), diameter 20.5mm, centre height 10.8mm.About more machine brand and models this item will fit for ,please see from the posted photos. Fit for Singer 101,1019,1021,1022,1025,1027,1200,1247,1247N,1263,1263N,1280,1280N,1288,1288N,1482,1485,1486,1488,1490,1492,1730,1802,1803,1812,185,1852,1853,1862,1872,1873,192,201,2102,2105,2106,2108,2110,2112,2114,2118,2210,2300,2302,2303,2304,2315,2330,2404,241,242,2430,2440,247,247AP,248,249,2500,2502,2503,2504,2505,2515,2517,252,2530,2543,257,258,259,2601,2602,2603,2604,2605,2615,2616,2628,263,2630,2643,2712,2718,2722,2724,2730,2732,2808,2818,285,288,292,2950 Fit for Singer 3100,3101,3102,3103,3105,3130,3140,3270,327,327K,328,328K,329,3314,3317,3343,337,338,347K,348,348K,353,354,358,360,362,367,368,401,403,404,413,413K,413K13,416,417,418,418K Stylist,4325,4522,4525,4526,4528,4530,4538,4552,4562,457, 457K,4572,4610,4617,4620,4622,4624,466,466K,476 Stylist,476K Stylist,477,477K,478,4814,4825,4828,4830,4832,495,500,5017,502,5028,503,503A,5040,5050,507,509,513,514,5160,518,522,527,533,534,538,5417,5430,543,547,560,5605,5610,563,5705,5710,57815,57817+ Fit for Singer 6010,6011,6012,6017,6021,6038,6102,6104,6105,6106,6110,6112,6114,6115,6116,6120,6124,6125,6126,6130,6136,6146,6152,6156,6174,6184,6201,6202,6211,6212,6214,6215,6217,6221,6233,631,6513,6522,6528,6533,6543,6544,6548,66,6606,6610,6620,66-6,6700 Series,6705,6800,7004,7015,7021,7025,7028,7029,7033,7035, 7100 Series,7101,7102,7104,7105,7106,7108,7110,7136,714,7146,717E,717 School,7174,7184,7186,719,7211,7212,724,734,774,776,800,8002,8007,8019,8100,8200,8220,833,834,844,8500,860 Srs+ Fit for Bernina sewing machine models: 719;Fit for Brother sewing machine models: VX1005;Fit for Dressmaker sewing machine models: 300Z;Fit for Necchi sewing machine models: 538;Fit for White sewing machine models: 8600, 8800 PART#: 172222P The alternative part number are: 6965, 172222P, 172336-001, 4127597-61, 820363-096 THIS LISTING INCLUDES : BRAND NEW HIGH QUALITY of Plastic Drop-In Bobbins fit for Singer 66 Class, 99 Class, 200, 300, 400, 500, 700, 800 series and many more . The bobbin is curved (not flat), diameter 20.5mm, centre height 10.8mm.