The metric measurements on these bobbins are 21mm in diameter and 8.5mm deep. These bobbins have a notch in the center for the bobbin winder.

fits Babylock Sewing Machine Models:
BL3000, BL4000, BL5000, BL5020, BL7000, BLQP

Bernette Sewing Machine Models:
320, 330, 340, 430, 440

Bernina Sewing Machine Models:
1000, 1000+, 1001

Brother Sewing Machine Models:
PQ1300, PQ1500, PQ1500SL, PQ1500SLPRW, XL2005, XL4001, XL5001, XL622, XL702, XL703, XL8015

Consew Sewing Machine Models:
103, 105, 199R, 210, 220, 2230, 230, 231, 292, 99

Elna Sewing Machine Models:
100, 1000, 101, 102, 103, 104, Sew Fun, Sew Green, Sew Zebra

Husqvarna Viking Sewing Machine Models:
2840, Mega Quilter 1200

Janome Sewing Machine Models:
1600P, 1600P-DB, 1600P-DBX, MB-4

Juki Sewing Machine Models:
DDL-227, DDL-5530, DDL-555, DDL-5550, TL-2000Qi, TL-2010Q, TL-2200QVP Mini, TL-72, TL-82, TL-98E, TL-98P, TL-98Q, TL-98QE, TR-7

Pfaff Sewing Machine Models:
1200 Grand Quilter

Singer Sewing Machine Models:
103K7, 188K1, 20U, 20U11, 20U13, 20U31, 20U33, 20U43, 206K, 251, 281, 291U3, 306K, 306K25, 306W, 319

Riccar Sewing Machine Models:
2600, 2800, 2900, 291U1, 2950, 3300, 3400, 3500, 3600, 4001, 4003, 414, 420, 500, 515, 525, 550, 555FA, 606, 651, 666FA, 800R, 805, 806, 807, 808E, 8400, 8500, 888, 906E, 9150, 9160, 9600, 9700, 9800, 9900, R551, R552, R650, R651, R750, R751, RE571, RE570, RE580, RE581, RE591, RE640, RM540, RM570
 

Singer 55623S Steel Bobbin

AU$1.20Price