Bernina Binder Attachment for Unfolded Bias Tape #88 (28 mm) Binder attachment for unfolded bias tape #88 is ideal for bias-binding fabric edges. For 28mm bias binding, unfolded. 28 mm (scant 1-1/8”). Binder attachment for unfolded bias tape #88 is ideal for bias-binding fabric edges. The unfolded tape is fed through the attached bias-tape feeder, positioned precisely on the fabric edge, and held in place securely until it is sewn. This produces neat, even edge bindings on home furnishings, quilts, and items of clothing. 28 mm (scant 1-1/8”)