B04004 Steel spool with holes all around this is a universal fitting and will fit most types of standard flat machines. Diameter 21.2mm width 9.2mm. Seki brand made in Japan.
52237NBL=BCDB1NBL6 Universal bobbin case fitted with NBL406 spring will fit all types of flat machines Brother,Singer,Juki. Towa brand made in Japan the best quality !!
HSH-7.94BTR Genuine Hirose hook & base for UBT machines will fit most types of brother flat machines with underbed trimmers. Best quality made in Japan