A pliers includes two main bodies pivotally coupled to one another. A first main body defines a first pivot hole and a second main body defines a second pivot hole respectively. The first pivot hole has a first inner peripheral section with a flaring conical shape. Furthermore, the first pivot hole has a second inner peripheral section with a flaring conical shape. The first inner peripheral section has a first cone angle and the second inner peripheral section has a second cone angle respectively. The second cone angle is smaller than the first cone angle. The first and the second main bodies are pivotally interconnected with a fastener. The fastener has a first outer peripheral section abutting and conforming to the first inner peripheral section and a second outer peripheral section abutting and conforming to the second inner peripheral section respectively.