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The Brother Bobbin Center Pin converts smaller 9.4 "L" sized bobbins to fit 11.5 "15J" size bobbin machines. Mostly used with prewound bobbins.
Part Number: BAB XD0835051
Alternative Part Numbers: XC8450051, XF5048001, XC8661251, XC8661151
Guaranteed to fit because it is a part.