In the video, a person wearing blue gloves is seen working on a machine. The person is holding a metal piece with several round protrusions on it. The person then places the metal piece on top of another metal piece with a hole in the center. The person then rotates the metal piece with the protrusions, aligning it with the hole in the center of the other piece. The person then places the metal piece with the protrusions into the hole, and rotates it to secure it in place. The person repeats this process with another metal piece with protrusions. The video ends with the person holding the metal piece with protrusions, which is now securely attached to the other metal piece.