US Patent 7171831 Tool for turning keys

A tool for turning keys comprising a tool body having an elongate slot adapted to removably receive the head of a key. The tool has an aperture, by means of which a key ring is attached to the tool. The aperture may have a constriction to prevent the key ring sliding along its length, therefore preventing the key becoming accidentally engaged in the slot in someone's pocket. A second slot is provided, crossing the elongate slot and perpendicular to it, to accommodate the part of the key ring nearest to the key. In addition to its use to turn a key, the elongate slot may also be used to engage with the ring pull on a can, and the tool body used to lever the ring pull, opening the can.