The Cavision 15mm Pair of Aluminum Rods -- 18 Inches Long let you add various 15mm-compatible accessories to your camera rig. You can connect them into your existing rig or use them to begin building your own rig from the bottom-up.
The rods are each 15mm in diameter and 18 inches long. They are made hollow and non-threaded out of robust aluminum.
15mm Pair of Aluminum Rods -- 18 Inches Long
6-Month Warranty Against Defects in Material and Workmanship