It's currently out of stock, unfortunately. And the company, Cox & Cox, is in England, so you'd be paying a pretty price for shipping. But their website is worth browsing; there are all kinds of beautiful home goods and some really pretty kitchen items.
• Cox & Cox website
Never fear, though. We found another walnut key, made by Alessi, that we think is just as cool (maybe even more so, with it's shiny, heart-shaped edges). And while it's a bit more expensive, it's available in the US.Nut Splitter/Walnut Opener, $21 from Alessi.
Obviously a good, old-fashioned nut cracker will do the trick, too. But this keeps the shell in tact and makes it less likely to crush the nut inside. What do you think?
Related: How to Roast and Peel Chestnuts
(Image: Cox & Cox)