We generally call the side pointed by the arrow the reference side. In fact, no matter what brand of guide rail it is, as long as it is a regular manufacturer, there will be such an arrow. It is mainly a requirement for installation. The manufacturer This side has been specially ground. When two guide rails are installed in parallel, the reference side is opposite, which can control the parallelism of the guide rails. Not only the guide rails, but also the slider also has a reference side, which is usually Polished.

Dongguan Luerte hopes to be helpful to you