Features 1、Simple and easy to use. Beautiful design. 2、High accurate and stable performance. 3、Professional and technical rail and block, strong and durable. 4、Small size, light weight, suitable for most automatic equipment. 5、Slider could easily and lightly move. Specification Features: Simple and easy to use. Beautiful design. High accurate and stable performance. Professional and technical rail and block, strong and durable. Small size, light weight, suitable for most automatic equipment. Slider could easily and lightly move. Specification: Material: Metal Type: Slide guide rail Slide track: Linear guide rail Accuracy level: H Length(Optional): Approx. 250mm/9.8in, 300mm/11.8in, 400mm/15.7in, 500mm/19.6inch, 550mm/21.6in Installation screw size(not included): M6(Rail), M3(Block) Weight: 217-417g Package List: 1 x Linear Guide Rail 1 x Slide Block Package List