Guaranteed to fit Pfaff sewing machine models:
Ambition 1.0, Ambition 1.5, Ambition Essential, Passport 2.0, Quilt Ambition 2.0, Smarter 160S, 260C Smarter

Guaranteed to fit Singer sewing machine models:
2010 Superb, 3321 Talent, 3323 Talent, 4411 Heavy Duty, 4423 Heavy Duty, 4432 Heavy Duty, 44S Classic Heavy Duty, 5511 Scholastic, 5523 Scholastic, 5532 Heavy Duty, 5554, 855SCH, 9100, H74, HD660, HD6600, HD6605, HD6800C, M3220