Description:1. The linear guide rail and the carriage block are made from bearing steel material, and the mini linear guide is made of plastic material, to ensure stability and smooth operation.2. The linear guide rail has a limit block at both ends, which can play the role of collision protection; The MGN12H sliding carriage block can provide precise linear motion control for 3D printers and CNC machine tools, minimizing vibration, ensuring smooth motion and reducing equipment wear; Plastic mini linear guide to assist installation, do not let the ball fall off, suitable for MGN12H slide block.3. First, install the mini linear guide on the slider, place the slider parallel to the guide rail, and then gently push the slider into the guide rail.