VAV linear slider are also called line rails, slide rails, linear guides and linear slide rails. They are used for linear reciprocating movement. They have higher rated load than linear bearings and can bear certain torque. In the mainland called linear guide, Taiwan is generally called linear guide, linear slide track.

Linear guides can be divided into three types: roller linear guides, cylindrical linear guides, and ball linear guides. The linear motion guide can be divided into sliding friction guide, rolling friction guide, elastic friction guide and fluid friction guide.

The linear guide motion is used to support and guide the moving parts to linear reciprocating motion in a given direction. Linear bearing is mainly used in automatic machinery, such as machine tools imported from Germany, bending machine, laser welding machine, etc. Of course, linear bearing and straight shaft are used together. Linear guides are mainly used in mechanical structures with high precision requirements.