The Zacuto Z-RE-FF2 is a 2-inch female/female rod extension with Female on both ends. (1 rod extension only).
Zacuto's rods are all lightweight; 15mm diameter with 60mm spacing and clear anodizing. They are made out of 6061 aluminum and the threads are ½” 13.
More information about Zacuto Products (Link to Zacuto Website)