The Edelrid HMS Strike Slider FG Locking Carabiner is a low-profile, lightweight locker for belaying and rappelling. An H-profile construction ensures superb strength while remaining ridiculously lightweight (2.3 ounces). Unlike most innovative locking systems, this automatic locker only requires one hand and is super quick and simple. The spring bar prevents cross loading, and the keylock nose makes sure the rope doesn't get hooked when you're taking climbers off belay.