With the knife edge facing you, there are two pieces of flat steel in the middle of the knife. One goes all the way from the top to the bottom of the handle and the one on the right is bent towards the right. That bent piece is the lock. You use your right thumb to push the right piece towards the straight piece (push the right piece to the left) and at the same time you close the knife blade. The same type of lock exists for the hook seat belt cutting blade on the back of the knife. You use your thumb to push in the piece of flat steel towards the center of the handle and close the hook blade.
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