Mammut Crag HMS Screw Gate screw-lock climbing carabiner

The pear shape, or HMS geometry, provides a wide, rounded surface area that allows your belay device or rope to sit comfortably without binding. This design also offers enough internal space to accommodate multiple knots or hitches, like a Munter hitch, which is essential for rappelling or emergency belaying.

The screw-gate on the Crag HMS is designed for reliability rather than speed. Because it uses a manual threaded sleeve, it is less prone to jamming from grit, ice, or dirt compared to automatic or triple-action locking mechanisms, making it a dependable choice for alpine or winter climbing.

The Key Lock nose eliminates the small hook found on traditional carabiners that often snags on slings, ropes, or bolt hangers. This smooth, notch-free design makes clipping and unclipping significantly faster and prevents the carabiner from getting caught when you are trying to clean a route.

While you can use it for various tasks, this carabiner is primarily designed as a master point or belay carabiner due to its size and screw-gate lock. It is generally too heavy and bulky to be used as a quickdraw carabiner for lead climbing, where you typically want lighter, non-locking options.

At 80 grams, this is a standard, robust HMS carabiner. It is not an ultralight model, but that extra weight translates into a durable construction that can handle the heavy wear and tear of frequent belaying and rappelling.