It's always nice having Cypher's Iris HMS Locking Carabiner attached to your climbing harness's belay loop. Its round rope-bearing surface helps the rope flow smoothly for belaying or rappelling, and despite its compact size, the surface accommodates munter hitches. The Iris comes in a standard screwlock, an automatic twistlock, or a super secure three stage lock, and the carabiner features a keylock nose for snag-free convenience.