Guaranteed to fit Elna Models:
434, 664, 664 Pro, 7100, Easy Cover, ef1, eXtend 264, eXtend 864 Air

Guaranteed to fit Janome Serger Models:
1000CP, 1000CPX Cover Pro, 1110DX, 1600P, 1600P-DB, 1600P-DBX, 1600P-QC, 2000CPX CoverPro, 204D MyLock, 3434D Juno, 434D, 434DR, 504D, 534, 534D, 634D, 644D, 7034D, 734D, 744D, 7933 Harmony, 8933D, 9002D, 9102D, AT2000D, CoverPro 3000P, Cover Pro 900CP, Cover Pro 900 CPX, HD9, HD9BE, HF3434D, HF504D, HF7933, HF9102D, MC6300P, MOD-Serger

Guaranteed to fit Kenmore Serger Models:
385.16631490, 385.16633, 385.16633790, 385.1664190, 385.16642090, 385.16644690, 385.16655100, 385.16677700

Guaranteed to fit Necchi Serger Models:
QS60, S34

Guaranteed to fit Pfaff Serger Models:
4752 Hobbylock, 752

Alternate Part Numbers: 98-784223-10/500