In the video, a person is seen using a wrench to tighten a bolt on a bike. The person's hand is visible, and they are holding the wrench with their fingers. The bolt is located on the bike's chain, and the person is turning it clockwise to tighten it. The background is blurred, but it appears to be a workshop or garage setting. The bike is stationary, and the person is focused on the task at hand. The wrench is silver and appears to be of a standard size. The bike chain is black and has a metallic sheen. The person's movements are deliberate and precise, indicating that they are experienced in bike maintenance.