They won’t be available to consumers until July 2012. But this week Black Diamond Equipment announced an unusual and potentially game-changing piece of gear for climbers. The RockLock and GridLock Magnetron carabiners will use “magnetic fields” instead of screw gates or spring-loaded sleeves to lock shut. The company touts the ‘biners as “more secure versus other spring-locking mechanisms on the market” and “a stronger and more reliable system than possible with springs.”