Folding Credit Card Knife for your Wallet

The CardSharp is an ultra thin knife that conveniently stores in a credit card slot in your wallet. It has a stainless steel surgical blade and a polypropylene handle that only requires three quick folds to transform it from rectangular credit card shape to a super sharp knife. The CardSharp is $25 from Iain Sinclair.

Source: http://the-gadgeteer.com/2011/09/04/folding-credit-card-knife-for-your-wallet/

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