Excel (Div. of Van Beest) Grade 10 Alloy Self-locking Swivel Hooks are made in France to stringent European standards. They are quenched and tempered and equipped with needle thrust roller bearings and will rotate while under load. Many basics swivels will only rotate with the load on the ground. These can be used on helicopter long lines, wire rope, flat web or round slings as well. The self-locking hook design makes the hook automatically close and latch when loaded adding an additional degree of safety. These are the best quality self-locking swivel hook we have seen for the price!