Circular embroidery attachment #83 lets you embroider unusual and decorative circles or semicircles. The attachment is screwed to the free-arm. The center of rotation can be either to the right or left of the needle, with the attaching screw lying flat enough to allow the fabric to feed smoothly over it. A diameter of between 1 inch and 5-5/16 inches (2.5 cm and 13.5 cm) can be set on the slide. 0083737000
 
For bernina machines made before 1997, you will need the old style feet, special order item, price will vary.