The Wooden Camera 15mm Rod Clamp attaches to 15mm rods to add 1/4"-20 screw-holes to your camera rig. Among the variety of accessories that can be mounted to these screw-holes is Wooden Camera's QB Battery Back Plate. This plate comes in different versions, each designed to have a different type of battery plate and ultimately battery attached to it. With these attached, the QB Battery Back Plate can be mounted right onto the screw-holes of the Rod Clamp. The ability to attach so is especially useful when you have no way of mounting a battery directly onto your camera and as an alternative are looking for a way to get the battery near the camera (so you can connect the two).