Ground rod? All I see is those wires, a hockey stick and a bowl of rat feces on the floor.I think it's two wires with terminal ends. One of them has a bolt through it, the other isn't connected. When he wants to couple them, he is attaching a nut on the other side of the bolt with both terminal ends touching each other.
I'm just trying to figure out if he is putting in a second ground rod at his solar array or something.. and determining whether he should be doing that or not.