Originally included with Bernette serger models:
B44 Funlock

Originally Included with Elna Serger Models:
Easy Cover, ef1, eXtend 864 Air, 434, 444, 664, 940

Originally Included with Janome Serger Models:
100CP, 1000CPX, 1600P, 1600P-DB, 1600P-DBX, 1600P-QC, 2000CPX CoverPro, 900CP, 900CPX, AT2000D, CoverPro 3000P, HD9, HD9BE, MB-4, MB4S, MB-7

Alternate Part Numbers: 5020405344