Guaranteed to fit Brother Sewing Machine Models:
640D, 920D, 934D, PL1050, VX1005

Guaranteed to fit Singer Sewing Machine Models:
1021, 1022, 500, 502, 507, 509, 513, 514, 518, 522, 527, 533, 534, 538, 543 Stylist, 560 Diana, 800, 802, 807, 809, 813, 814, 818, 822, 824, 827, 833, 834, 838, 844, 860

Alternate Part Numbers: 150XL