The video shows a person's hands holding a knife and removing the blade. The person then places the blade on a table and picks up a screwdriver. The person uses the screwdriver to remove the screws from the blade and then removes the blade from the handle. The person then places the blade back on the table and picks up a new blade. The person then uses the screwdriver to remove the screws from the new blade and attaches it to the handle. The person then picks up the knife and shows it to the camera.