1. It includes 2pcs of super lightweight 15mm-Railblock-3.
2. Each Super Lightweight 15mm-Railblock-3 comes with two rod clamps for 15mm rods, which could be tightened via 2 rotatable wingnuts.
3. The adjustment of one wingnut will not affect the operation of the other wingnut.
4. It is equipped with an abundance of 1/4" threaded holes for DIY operations.