The video shows a person holding a Black and Decker circular saw and demonstrating how to change the blade. The person first removes the blade by unscrewing it from the saw. Then, they show the new blade and insert it into the saw by screwing it in place. The person then adjusts the tension of the blade by turning a screw. Throughout the video, the person's hands are visible, and they are wearing a black shirt. The background is a wooden surface.