Linear rail, also known as line rail, slide rail, linear guide rail, linear slide rail, is used in linear reciprocating motion, and can bear certain torque, and can achieve high precision straight line motion in high load condition. In the mainland, it is called linear guide rail. Taiwan is generally called linear guide rail and linear slide rail. It is mainly used in automatic machinery, such as German imported machine tool, paper bowl machine, laser welding machine, tool holder of machine tool, trailing board and so on. Of course, the linear and linear axes are used.