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I forgot to mention you can get the same things on amazon from the same company as my first link but pay an extra £3.48 for delivery. No delivery cost direct, a no brainer http://www.amazon.co.uk/gp/product/B00C44TD4E/ref=noref?ie=UTF8&psc=1&s=kitchen

What you seek are called Half Moon nuts. They are for cots and beds See http://www.direct-fittingsuk.com/bedbunk-boltshalf-moonlunarluna-nutswashers-6mm-thread-cast-zinc-2-4-8--bulk-packs-4956-p.asp or search Ebay for Half Moon Nuts, there are always some on there :)