Thin and light: in keeping the existing action accuracy and product life, its full length is only 1/2~1/3 of the general cylinder, play both thin and light characteristics; Easy installation: use embedded installation method, without any accessories to save space requirements; Easy maintenance: simple assembly method for design, convenient assembly and maintenance; 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;