BD's new locking carabiner, the Black Diamond Magnetron GridLock Carabiner, uses magnets instead of the rather more tedious screw down sleeve that carabiners have used for ages. Seems to be the hot item of the season for the climbing aficionado in your life. 

The most revolutionary belay carabiner in a decade.. Featuring Black Diamond's new magnetic locking mechanism, the Magnetron GridLock carabiner brings a new level of ease and safety to belay-specific carabiners. This unique gate design doesn't freeze in the winter and doesn't clog up with sand and dirt the way a screwgate does. In addition to the one-of-a-kind gate, the Magnetron GridLock also has a separated bottom and top so as to completely eliminate the chances of cross-loading, because this is one piece of gear that absolutely cannot fail. To further ensure that its safety, Black Diamond hot-forged this carabiner to make it as tough as it can be. As a final touch, this carabiner also got a keylock nose to eliminate snags when you're taking your friend off belay.