Guaranteed to fit Babylock Sewing Machine & Serger Models:
BL3-437, BL3-437D, BL415, BL428K, BL4-428D, BL4-437D, BL4-728, BL4-728D, BL4-736, BL4-736D, BL4-738, BL4-738D, BL4-738NS, BL4-828D, BL4-838D, BL5260, BL5260D, BL5280E, BL5280ED, BL5280ENS, BL5360ED, BL5380ED, BL80, BL90, BLSE200, BLSE300, DBL34-60, DBL4-738

Guaranteed to fit Simplicity Serger Models:
SL880, SL880D