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They offer less resistance which translates to less drag to the bobbin thread tension. 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. works on many industrial style machines
Guaranteed to fit Singer Sewing Machine Models:
103K7, 188K1, 20U, 20U11, 20U13, 20U31, 20U33, 20U43, 206K, 251, 281, 291U3, 306K, 306K25, 306W, 319
Guaranteed to fit Brother Sewing Machine Models:
PQ1300, PQ1500, PQ1500SL, PQ1500SLPRW, XL2005, XL4001, XL5001, XL622, XL702, XL703, XL8015
Fits New Home/Janome models: 1600P, 1600P-DB, MB-4,
Alternative 117132-0-01, 416055501, 4160555-01, 55623, H12413002, SA159
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