The BERNINA Stitch Regulator (BSR) produces neat, consistent stitching with stitches of precisely the same length while free-motion sewing. Reacting to the movement of the fabric, it adjusts the speed of of the machine automatically when free-motion quilting with the feed dog lowered. The BERNINA Stitch Regulator (BSR) can sew both straight- and zigzag stitches. It is superbly suited to ambitious professional-level sewing projects such as free-motion quilting on all fabrics