The DMM Sentinel HMS Locksafe is an eye-catching and rather unusually shaped biner, making it standout from other similarly spec'd carabiners. However, there is far more to it than mere cosmetic appeal. The DMM Sentinel is not only a very neat and light belay carabiner, but also one that's loaded with several interesting design features.
The kink in the spine has real functional advantages. For a start it allows for a bigger gate opening and makes it easier to handle, but it also encourages the biner to stay correctly aligned on your harness belay loop.
The DMM Sentinel HMS is versatile enough to make a good rigging biner too. You can fit a couple of clove hitches on it; plus it has a slightly offset shape that increases strength by directing force into the spine of the biner.
Locksafe Mechanism This clever triple-action, locking mechanism is almost as simple to use as the original spring-loaded 'Kwiklock' mechanisms, requiring just one extra push-up action of the barrel before the twist. This extra dynamic (level of safety) means the biner provides far better protection against accidental opening.
Lightweight HMS locking belay biner
Wide gate opening
HMS shape encourages correct alignment on the belay loop for correct loading and increased volume to enable improved handling and compatibility with thicker ropes and slings