This listing is for a High quality Bobbin Case and 10 pcs.Bobbins 

for Singer FeatherWeight Sewing Machines.  221,221k,222k,301

bobbin case Part # 45751 (NOT 45750 !! )

bobbins       Part # 45785 

Please note the size of the bobbin case shown in the pictures,to see if this bobbin case can fit your rotary hook.

If your original bobbin case was marked 45750 as in some of the earlier Featherweights( came off an late 40's or early 1950's)
, then this bobbin case may not fit or if fits may hang the thread occassionally.