Janome Hemmer Foot 2mm D (Cat C). The hemmer foot sometimes eferred to as the rolled hemmer is used to stitch the narrow rolled hems usually found on shirt tails, table linens and along the edge of frills. The hemmer is designed with a scroll shaped feeder on top and a straight groove on the underside which determines the width of the finished hem.There are three different sizes of hemmer foot available. The standard 2mm hemmer foot is for lightweight fabrics. The 4mm and the 6mm hemmer feet are for medium to heavier fabrics and are available as a boxed set. (A NICE ADDITION TO THE SEWING BOX!)