HMS carabiner with safety mechanism against accidental cross loading. The further development of the popular belay carabiner convinces with an improved design, higher breaking load and less weight. What remains is double safety with easy handling. The screwgate can only be operated if the Safety Gate has also been opened. Accidental opening is just as impossible as unintentional twisting of the carabiner in the belay loop of the climbing harness. This prevents dangerous loads in the transverse direction. For the Smart 2.0 belay device, Mammut recommends the use of the Smart HMS 2.0 carabiner.