This spool pin cap is compatible with a 1/4-inch spool pin and has an outer diameter of approximately 1 3/4 inches. 

Part # 511113-456

Fits Singer models: 1482, 1485, 1486, 1488, 1490, 1492, 2010 Touch-tronic, 2102, 2105, 2106, 2108, 2110, 2112, 2114, 2118, 2210, 2440, 2502, 2503, 2504, 2505, 2515, 2517, 2530, 2543, 2712, 2718, 2722, 2724, 2730, 2732, 2808, 2868, 2950, 30920, 3270, 3317, 343, 4205, 4206, 4210, 4212, 4220, 4228, 4325, 4325C, 4500, 4552, 4562, 4572, 4600, 4613, 4617, 4620, 4623, 4624, 4832, 5040, 5050, 5160, 5417, 5417C, 5430, 5705, 5710, 5800, 5802, 5805, 5806, 5808, 5810, 5812, 5814, 5816, 5817, 5818, 5820, 5825, 5830, 5838, 5910, 5932, 628, 6200, 6210, 6211, 6212, 6214, 6215, 6217, 6218, 6230, 6233, 6234, 6235, 6408, 6412, 6416, 6423, 6606, 6620, 6630, 7000, 7004, 7005, 7025, 7028, 7029, 7033, 7035, 7043, 7200, 7211, 7212, 8220, 9000 Series, 9005, 9008, 9010, 9015, 9018, 9020, 9022, 9030, 9032, 9044, 9124, 9134, 9136, 9200, 9217, 9323, 9334, 9400, 9410, 9417, 9420, 9430, 9444, 9803, 9805, 9806, 9808, 9810, 9812, 9816, 9818, 9824, 9828, 9832, 9836, 9900 Series, 57815, 57817, 57820, 57825, 93220, CG500, CG550, CG590, CM17, CP17, DL17, DX14, FM17, FM22, HD102, HD105, HD110, SM14