This pack of 10 Metal Bobbins Class 66 is part number 172222 (Alternative Part # 32522). It measures 20.5mm in external diameter, 10.8mm in height,
Sewing Machine Parts Class 66 Singer25pk #172222 For Singer 66 66
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172222 bobbin bobbin for Singer 66 66-16 Singer Class 66 Apollo (Steel) Sewing Machine Bobbins 32522 bobbin bobbin for white 8600 8800
20pcs bobbins Sewing Machine Parts Class 66 Singer #172222/32522 for Singer 66 66-16