The Bernina #C22 10/40 Single Fold Binder attachment is used with the Binder Accessory Attachment on the L890. With the single-fold binder, fabric edges and necklines can be perfectly bordered with bias tape. The unfolded tape is inserted through the attached guide rail, folded over twice on the upper side while the under side remains open, and is then sewn on with a cover stitch. For the perfect look, the bias tape can also be self-made. Tapes of 30 mm width result in a finished width of approx. 10 mm. Tapes of 45 mm width result in a finished width of approx. 15 mm. An attachment adapter is required to use the tape binder.