Tether Tools Rock Solid 4-Head Tripod Cross BarTether Tools Rock Solid 4 Head Tripod Cross Bar Tether Tools Rock Solid 4 Head Tripod Cross Bar lets you mount your Tether Table Aero on the same solid support as your camera to build a custom, ideal workstation that meets your specific needs. The Rock Solid 4 Head Tripod Cross Bar with 4 heads mounts to a tripod center column 3 8 thread. It can also mount to a lightstand using a Rock Solid Baby Ballhead Adapter. The Rock Solid 4 Head Tripod Cross Bar