The video shows a person's hand using a wrench to tighten a bolt on a piece of machinery. The person's hand is visible, and the wrench is being used to turn the bolt clockwise. The machinery appears to be made of metal and has several other bolts and screws visible. The person's hand is steady, and the wrench is applied with force to tighten the bolt. The background is blurred, but it seems to be an industrial setting.