Shang Shang is a rod-shaped drilling tool with a short size made of steel and has protrusions at its beginning called thorns. These thorns are attached to another tool called Shang holder by a hammer. In other words, Shang acts as an interface between the drilling hammer and the bit and casing.
When purchasing Shang, you should pay close attention to its plating, which should be local. Due to the lack of necessary equipment for this purpose in Iran, this type of plating is not performed, so you should purchase from reputable brands.