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,
SINGER sewing machine Bobbin class 66 172222PS
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20 METAL DROP-IN BOBBINS FOR SINGER SEWING MACHINE CLASS 66 99
Singer Model 66 Sewing Machine Parts: Original and Replacement
ckpsms Brand - Metal Bobbins #172222 Compatible with
Singer 66 Bobbins