Baby Lock Single Fold Bias Binder with Rake 40mmBaby Lock 40mm Single Fold Bias Binder with Rake. (D13 3 15E). The single fold bias binder is a quick and precise solution when you want to bind fabric edges or necklines with a bias tape using the cover stitch or double chain stitch. The upper side of the bias tape is folded and the reverse is single layer thus reducing bulk. Inlet 40mm outlet 15mm. Compatible machines: Ovation Gloria Cover Stitch