Aluminumis significantly lighter than steel and is therefore far more popular in the outdoor and climbing industries where weight is a major factor.
Non-LockingGate for general use and when clipping quickly is important. All non-locking carabiners are spring-loaded to ensure immediate gate closure upon release
Wire gateuses a loop of stainless-steel wire as a gate. The wire itself created a “spring to close” gate, eliminating the need for an extra mechanism.
Pin NoseGate is a notch in the nose of the carabiner to maintain the structure and strength. This nose type is typically stronger.
Modified “D” shape.This shape helps to push the load to the back of the “spine”. Allows weight to be carried primarily by the spine and less by the gate—making for a stronger and lighter use.