Neewer 2pieces 20inch/50cm Long 15mm Black Aluminum Alloy Rod Set with Rod Connector Bolts for 15mm Rod Support Rail System DSLR Rig Stabilizer 20inch/50cm 15mm rods length each^With rod connectors^Special design for 15mm rail rod support system^All 15mm rod with the inner thread so you can extend the rod with rod connector bolt^Aluminum alloy rod light and well processed