For synthetic suedes and elastic knitwear. Constructed with two needles on a cross bar from a single shaft. Sews two rows of decorative sching at the same time on stretch fabrics or knitwear. Only for use on zig-zag machines. It comes in sizes 2.5/75 and 4.0/75 (select above). &; Choose the size based on the type and size of thread being used. To avoid snags and needle holes on knit garments, it' s a good idea to use a new needle for each project. Schmetz style number 1774 and 1775, respectively. One (1) needle per card. A Qty. of " 1" = 1 card.