A bow saw is a woodworking tool used for straight or curved cuts. It consists of a narrowed toothed blade suspended between two long narrow handles that are supported and separated by a narrow rod in the center of the handles, making an H shape. The blade in kept in tension with a twisted cord that is attached to the opposite ends of the handles. The cord is twisted with flat key attached to one loop of the cord. The key hits the center rod, which keeps the cord from untwisting.