Guaranteed to fit Consew sewing machine models:
206RB-5, 206RBL-18, 206RBL-30, 223, 223R, 226R-2, 227, 227FS, 227R, 227R-2, 227RFS, 254B-3 255B-K, 255B-3, 255RB-3, 255RB-3D, 255RBAT, 255RBATC, 255RBL-25, 277, 277R, 277RFS, 287RB-1, 287RB-2, 289RB-2, 327RB, 328RB, 329RB-1, 333B-2, 333R, 333RB-2, 33RBL-1, 339B-2, 339RB-1, 339RB-2, 339RB-3, 339RB-3D, 339RB-4, 339RBATC, 339RBL-1, 339RBL-25, 359, 369RB-2, 387RB-2, 389RB-2, 744R10, 744R20, 744R30, 745R20, 745R30

Guaranteed to fit Singer sewing machine models:
144B8BL-20, 144B8BL-30, 145B28BL-20, 145B28BL-30, 153B8BV, 155B8BV, 238B27BK, 238B28BK, 238B27BLK, 238B28BLK