The unique rounded design positions ropes perfectly for rappels and creates a very wide gate opening with substantial inner working space. Unlike many belay carabiners, the HMS Compact has no corners so ropes have nowhere to bunch. This results in less friction for smoother rappels and belays and helps helps keep heat in check on long rappels. a Rappel, Belay, Rigging a Extremely smooth belay and rappel carabiner with secure screw lock a Curved spine offers exceptional clearance a Large opening and keylock nose make clipping ropes and webbing easy Note that this item of climbing safety equipment is non returnable. Please call us toll free at 877 236 8428 or e mail bentgatebentgate.com with any questions.