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 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. Perfect for free-motion quilting with a controlled stitch length. The sewing speed adapts automatically to the speed of the moving fabric. Automatic control of the stitch length ensures absolutely even stitch formation. For 9mm machines with BSR function.