DESIGN & DETAILS: HMS carabiner built with an extra safety mechanism to prevent accidental lateral loading New and improved version of Mammut's popular carabiner Designed with a higher breaking load and reduced weight Screw locking can be operated only when the safety gate is open Constructed to avoid any unintentional twisting of the carabiner in the belay loop of the climbing harness Mammut recommends use of the Smart HMS 2.0 carabiner for the Smart 2.0 belay device (sold separately) Key lock nose provides easy clipping and unclipping without snagging.