Use this attachment for binding edges with pre-folded bias tape,  it helps to achieve perfect corners and beautiful curves to be created using utility or decorative stitches. 
Choose size for width of bias tape.
1. Binder 13 mm 
2. Binder 20 mm
3. Binder 25 mm
The binder attachment is used in conjunction with Binder foot #95 / 95C.