52237NBL=BCDB1NBL6 Universal bobbin case fitted with NBL406 spring will fit all types of flat machines 1,Singer,4. Towa brand made in Japan the best quality !!
S31x1/4" 6.4mm Outer piping foot use with inner foot S30. Will fit the following types of walking foot machines 1 B837 4 LU-563 Singer 111W and Seiko STW-8B.