Especially if it proves to be very effective, The Open Organisation of Lockpickers (TOOOL) Lock-Pick Card may conjure mixed feelings. While this credit card sized set of utensils could have come in handy the last time you locked yourself out of the house, I would not want to catch this in the hands of the wrong sort of person.
Six individual implements come with this wallet-sized bolt emergency kit, cut from a single piece of metal. When they're needed they can be snapped out of the frame one by one, and stored on keychains or in your billfold where they may be accessible in the future. Each instrument has a different tip, designed to unfasten a range of different padlocks and latches. Just try to avoid the sudden freedom of use that comes with owning the TOOOL Lock-Pick Card.