Husqvarna viking hemmer foot 10mm cat 7 rolls a 10 mm double hem in light to medium weight fabrics straight stitch length 2 5 snap on the a foot additional information1 snap 10 mm hemmer onto needle plate of machine 2 place fabric into the scrollguide of the 10 mm hemmer rolling it up to the needle 3 sew do not help the fabric roll simply guide it suitable for designer diamond designer ruby designer topaz 3020 sapphire series