Directivity: The double piston rod provides a high degree of resistance to bending and torsional rigidity, ensuring the cylinder life and excellent steering performance; Easy installation: the use of embedded installation, without any accessories to save space requirements; Magnetic switch: the assembly slot is reserved at the periphery of the body, so that the magnetic switch is very simple when installing and fixing and adjusting its position; The assembly groove is reserved in the periphery of the body, so that the magnetic switch is designed by simple assembly method when the installation is fixed and the position is adjusted, which is convenient for disassembly and maintenance;