The top bar has a 1/4-inch screw and a ball head, allowing you to attach small cameras, video lights, microphones, monitors, etc. • The main body is made of metal and has many holes. A camera rig frame for changing positions and adding accessories. • The bottom plate part: A base for attaching to a tripod or clamp, or for placing other equipment. I am selling it because I don't use it. Everything in the photos is included.