This is a Singer SR155 ribber that fits the SK155 chunky (9 mm gauge) knitting machine - either the Singer or the Studio and also the SK890 modular chunky machine. In it's original box, in really good condition. Looks like it was used once if that. I originally bought it for my use but have since bought another chunky machine. Missing a few small items (two clamps, close knit bar, double eyed needle and 2 side hangers) but these can be easily obtained online. Pick up only.