Exciting new additions the Bernina accessories range.
With the couching inserts, you can creatively sew yarns, cords, and wool or felt threads on to your project. Enjoy easy couching using either a plexiglass ruler for guidance or the free-motion technique. The inserts are for use with the Adjustable Ruler Foot #72 and are attached to the underside of the foot.  The use of high-quality materials makes the inserts very strong and protects the surface when quilting with metallic yarns and cords.
 
The three inserts with hole diameters of 1.4, 1.8, and 2.2 mm are suitable for thin, medium, and thick cords.

Important: The inserts extend the foot (+3.5 mm). So that there is no conflict with the stitch plate, the height of the foot should be set to the minimum (from 4 mm to 0 mm) prior to installing the foot via the dial.
Content of set:-
1 x couching insert  1.4 mm
1 x couching insert 1.8 mm
1 x couching insert 2.2 mm