Linear Guide Miniature Linear Motion Slide Rail Guideway with Bearing Block for 3D Printer Item Type: Linear Guide Material: Bearing steel Model: MGN9H 300 1R(Slider extension) Type: Sliding guide Sliding Track: Linear Guideway Slider Width: Approx. 20mm / 0.79in Slider Thickness: Approx. 8mm / 0.31in Overall Thickness: Approx. 10mm / 0.39in Width of Slide Rail: Approx. 9mm / 0.35in Length: Approx. 300mm / 11.81in Number of Slider Blocks: 1 Scope of Application: Sliding doors such as the sliding slides, the upper slides of curtains and the railway tracks of trains are specific applications of the rails. The rails can also be used on any machine or equipment that needs to be slid with a sliding slide.