This add on will convert the leash clip on your leash to the locking jaw swivel. It is made with solid brass and comes in brass or silver color. This is a swivel alternative to the locking carabiner. 
 
If upgrading a double ended leash with two clips, you must add the upgrade twice to change both clips.
 
If you have difficulty using your hands to manipulate clips, this may not be the right clip for you. The lock must be flipped into place to lock, and flipped out of place to open the snap.