Linear (rail) guides are widely used in the production industry, mechanics of machines and devices, and especially where incredible precision and durability does matter. The linear guides form rails with a profile and rolling carriages. Carriages containing a ball bearing are covered and sealed against external influences.
A linear guide has the advantage that it allows the components to move very accurately at high speeds. There are many examples of application, for example rolling carriages, which base their principle on this type of guides, provide extraordinary accuracy, but also smoothness. This is important, among others in CNC machine tools or 3D printers.