Baby Lock Double Fold Bias Binder with Rake 30mmBaby Lock 30mm Double Fold Bias Binder with Rake.(D13_4_08E). The double 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. Both the upper and lower side of the bias tape are folded double here. Inlet 30mm outlet 8mm. Compatible machines: Ovation Triumph Gloria Euphoria