Screw gate locking carabiners are safe, but they can unscrew at inopportune times. Twist lock carabiners never unscrew, but they are a pain to open with one hand. Black Diamond’s solution: A magnetic locking carabiner you can open with one hand. Hitting the market in July 2012, the Magnatron carabiner has a spring loaded gate topped with two magnetic wings (the green parts) that unlatch with a quick pinch, and slap shut automatically. It’s a smart looking system we’re dying to test in the field.