Singer Bobbin Case Fits Models SEQS-6000, SEQS6700, XL400, XL550 And Others Singer Bobbin Case for Singer XL550 sewing and embroidery machines. Fits Singer Models: 1, +1, 160, 70, 8768, FQ4, SEQS-6000, SEQS6700, XL-400 & XL550 Fits Husqvarna Viking models: 600E