This little steel ball has a device that can be turned into a sharp hacksaw, which Ren Woxing used to saw off the fetters.
When competing with Ling Huchong before, Ren Woxing finally used the internal force. His internal force is so strong that Meishan and the four villa owners are stunned, so as long as he breaks free from the shackles, he can escape from the dungeon smoothly.