Carabiners chosen for fall protection or rescue purposes must be self-locking or double locking. Carabiners from Safety Direct are made from high tensile alloy steel or aluminum. They have a minumum breaking strength of 5000 pounds (22.2 kilonewtons) and are proof tested to 3600 pounds (16 kilonewtons).

N2592 Autolocking Carabiner

RP773 Autolocking Carabiner