DOUBLE WELT FOOT
S93 SIZE: 1/4" OR 6.4mm

I do have other sizes in other listing

ZOJE-0268, WIMSEW W-0618-1 HIGHLEAD GC20618-1, DC0618-1, JACK 6-7 AND MANY MORE

Will fit the following types of walking foot machines Brother

B837 Juki LU-563 Singer 111W and Seiko STW-8B
Many other modern style compound feed machines