Common Part (Serger) (Babylock) - Upper Blade (Knife)
Babylock: BL4-415
Babylock: BL4-428D
Babylock: BL4-728D
Babylock: BL4-738D
Babylock: BL5260D
Babylock: BL5280ED
Babylock: BL5360ED
Babylock: BL5380ED
Simplicity: SL880D
Babylock: BL4-736D
Babylock: BL4-838D
Babylock: DBL34-60
Babylock: BL80
Babylock: BL90
Babylock: BLSE200
Babylock: BLSE300
Babylock: BL415
Babylock: BL428K
Babylock: BL3-437D
Babylock: BL4-436DF