Below is the review from PuzzleMad website: http://www.puzzlemad.co.uk/2012/01/more-torture-from-wil-strijbos.html
Believe it or not Wil has made a disentanglement puzzle out of a standard 22mm double ended Chrome Vanadium spanner, a steel chain and a metal ring! This puzzle is 26cm long and really quite heavy - don't drop it on your foot!!! An 11mm version is also available with a beaded chain and plastic ring. The aim is to remove the ring from the contraption. It looks pretty simple - just take the ring off the end! Unfortunately this won't work because the chain is too tight to allow such a movement. It requires a small series of movements to achieve it and is not hugely difficult for anyone who is used to entanglement puzzles but is really quite a novel feeling doing it on a spanner.
Buyer please covers the 4.5% PayPal fee.
Shipping: £7 in the UK; £15 in EU; £25 Rest of world