BERNINA Adjustable Ruler Foot #72 allows you to sew along Plexiglas rulers to create decorative quilt designs such as lines, feathers, circles etc. Decorative quilt designs such as lines, feathers, circles etc. are created using a 1/4 in. thick Plexiglass ruler; markings on the inside and outside for simple, precise sewing. The dial lets you adjust the height of the foot individually to the fabric thickness. For 5.5 mm and 9 mm machines.