The Mammut Classic HMS Screwgate carabiner is a medium sized pear shape carabiner. It is perfect for building belay stations while climbing in the Sierra or using with a belay device in the Owens River gorge. The screw locking is easy to operate even in icy or dirty environments. The key lock nose makes for snag free clipping and unclipping. The orange safety marking acts as a warning if the carabiner is not screwed closed.