Rondo Swivel Unit Rondo unit, converts any single seater, into a ‘swivel’ chair. available in the following sizes: 50cm diameter 60cm diameter 72cm diameter please note this is not a stock item, allow 7 days for delivery. Category: Townsend Products Related products WCU [flat seat] 3 Springs View product Sytex Web View product Web Rider [flat seat] View product WCU [domed seat] View product