Safemax Steel Screw Locking Karabiner

Carabiners are widely used in rope-intensive activities such as climbing, sailing, hot air ballooning, rope rescue, construction sites, window cleaning, whitewater rescue, etc.
They are made from both steel and aluminum.
Those used in sports tend to be of a lighter weight than those used in commercial applications and rope rescue.
There are three broad categories of locking mechanisms for carabiners: auto-locking, manual locking, and non-locking.
Locking carabiners have the same general shape as non-locking carabiners but have an additional mechanism securing the gate. These mechanisms may be either threaded sleeves (“screw-lock”), spring-loaded sleeves (“twist-lock”).