or tubular fabrics, respectively, are needed. Double bed machines have two flat beds facing each other, in order to produce purl and plain rib fabrics plus a variety of multi patterns. Ribbing attachments can be added to single bed machines to achieve a similar result. Without a ribbing attachment, a single bed knitting machine will only be able to make purl fabrics.

Late 20th century domestic/studio models typically have 120 to 200 latch-hook