For Babylock Models: BL 3-726, Bernette 440, 705, 715, Easylock EZ100 serger, Montgomery Wards 1932, 1947, Necchi 503A, 534FB, 535FA, 537L, 575FA, 4575, 4795, Riccar 551, Simplicity SL880W, Viking 1610, White 221, 510, 734