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39572 Upper Knife Holder Block Union Special 39500, 39600 Feed Serging Machine 5/16" KM18 Bush Siruba 747 Overlock39572 Upper Knife Holder Block Union Special 39500, 39600 Feed Serging Machine Spare Parts Guaranteed to fit in following sewing machine model : Union Special 39500J, 39500QA, 39500FA, 39500FS, 39600CA, 39600A, 39500QS, 39600FA, SINGLE NEEDLE TWO AND THREE THREAD PLAIN FEED INDUSTRIAL SEWING MACHINES SERGING AND OVERSEAMING MACHINES