The Overlock and Coverstitch Height Compensating Tools make it easy to sew over cross seams and trims of different heights. With heights of 1.5 and 3 mm you can sew from fine fabric to heavy and stiff material over-seams. Continuing to sew will move the height compensating tool away backward underneath the presser foot by means of fabric transport. Fits L890, B42, b48, b62, and b68 machines.