Janome Rolled Hem Foot (6mm) For 9mm Max Stitch Width Machines. The hemmer foot, sometimes referred to as the rolled hemmer, is used to stitch the narrow rolled hems usually found on shirt tails, table linens, and along the edges of frills. The hemmer is designed with a scroll shaped feed on top and a straight groove on the underside which determines the width of the finished hem. This 6mm foot will allow for the use of heavier fabrics.