What Makes a Self Locking Hook Different from Other Hooks?

The main advantage of self locking hooks is that it will close itself when you’re loading it, which makes operations much safer.

With a spring-loaded latch on a sling hook, it’s a little bit cheaper because it’s just a single-forged piece with a metal latch attached.  Self-locking hooks are two forged pieces with a more complex spring design.  For swivel hooks, there are multiple forged pieces of metal.