Accessory Holder for Bernina Binder Attachments The Bernina Binding Attachment Accessory Holder is the required mounting bracket for the Double Fold Binder #C21 and Single Fold Binder #C22. Without this holder, the binder attachments cannot be installed on your Bernina overlocker. The holder provides stable, precise alignment so bias tape feeds evenly through the binder attachment during stitching. This results in clean, consistent binding on fabric edges and necklines. Compatible Binder Attachments Double Fold Binder #C21 for folded binding on both sides of the fabric edge Single Fold Binder #C22 for single-sided binding finished with a coverstitch For a related option, see the Binder Foot #95C. Compatible Machine Categories OL-A / OL-D: 1300DC / OL-E: 1300MDC / OL-G2 Not sure which category your machine is? Find Your Machine Category