Bernina #18 Button-Sew-On Foot

This is a genuine, used like new Bernina Button-Sew-On Foot #18. In perfect condition. 
Function:  The BERNINA Button Sew-On Foot #18 is a specialized presser foot used to securely attach flat buttons, snap fasteners, hooks, and eyelets by machine, eliminating the need for hand sewing.
Key Functions
Secure Grip: The bottom of the foot features a rubberized sole that prevents the button from shifting while the machine is stitching. 
Adjustable Thread Shank: It includes an adjustable center toe/pin. By adjusting the height, you can create a customized "thread shank." This gives buttons on thicker garments (like heavy jackets or coats) enough clearance so the fabric lays flat when buttoned.
Versatile Embellishment: Beyond buttons, you can use it to attach decorative items like bows or sequins.
Machine Compatibility: It is designed to work with both older and newer BERNINA models.
Supported Machine Sizes: Compatible with both 5.5 mm and 9 mm BERNINA machines.
Model Families: It fits a massive range of BERNINA categories (B, C, D, Ea2-4, Eb2-4, Ec, F, and G), including the BERNINA 200, 300, 400, 500, 700, and 800 series.Older vs. 
New Machines: The foot generally works across modern computerized models, as well as older models going all the way back to the 1630 series (though early vintage versions may lack the modern rubber grip or adjustable pin).