Use BERNINA Gathering Foot #L18 to sew decorative ruffles. Sew individual layer of a cloth onto a flat fabric; gather a flat fabric while neatening the edges; or ruffle on both sides of fabric strips. The fabric to be gathered is positioned underneath the Gathering Attachment, while the fabric that remains flat is added on top. The fabric is gathered with differential feed while it is sewn and neatened together with the flat fabric. Compatible with L 850/860.