Lower Looper, Babylock #61300
Guaranteed to fit Babylock Serger Machine Models:
BL402, BL530ED, BL5370, BL537OED, BL550, ST600L
Guaranteed to fit Riccar Serger Machine Models:
RL739DE, RL749L
Guaranteed to fit Simplicity Serger Machine Models:
SL4380BH, SL4380ED, SL4390ED, SL4690L