BERNINA Binder Attachment 25mm Foot #87For binding edges with pre folded bias binding in 25mm (1") width. Binder Attachment for Pre Folded Bias Tape #87 is the ideal tool for sewing neat edge finishes with pre folded bias tape, providing garments, home furnishings and quilts with an even, attractive finished edge. Binder Attachment for Pre Folded Bias Tape #87s attached bias tape feeder ensures ease of handling and attractive, even edges.