the second tube 31 into the copper sleeve 21 smoothly therefore one does not encounter any difficulty when connecting to the two wires 41 51 this therefore increases the work efficiency of the user later on the user simply uses a pinch not shown to pinch the connected mounting end and the connecting end fixing the core lines 42 52 of the two wires 41 51 in the copper sleeve 21 for conducting an electrical current while the guiding surfaces 14 34 smoothly guide the core lines 42 52 of the wires 41 51 into the copper sleeve 21 the skins 411 511 of the wires 41 51 are blocked by the guiding surfaces 14 34 that is the large diameter ends of the guiding surfaces 14 34 exactly allow the insertion of the skins 411 511 but the guiding surfaces 14 34 shrinking toward the connecting end 13 and the mounting end 32 block the skins 411 511 of the wires now allowing only the core lines 42 52 of the wires to enter this ensures the stability of the electrical conductivity of the wires 41 51 after the connection 1 the first tube and the second tube are integrally formed using an injection molding machine they involve simple manufacturing processes and are suitable for mass production since the first tube and the second tube are connected by mounting the assembly is simple and quick 2 the first guiding surface of the first tube and the second guiding surface of.