Item Type: Linear Rail Guide_x000D_ Material: Bearing Steel_x000D_ Model: MGN12C_x000D_ Rail Height: Approx. 6.5mm / 0.25in_x000D_ Rail Width: Approx. 12mm / 0.47in_x000D_ Leading Thread: M3_x000D_ Guide Hole Spacing: Approx. 20mm / 0.78in_x000D_ Length (optional): Approx. 100mm / 3.93in, 150mm / 5.9in, 200mm / 7.87in, 250mm / 9.84in, 300mm / 11.81in, 350mm / 13.77in, 400mm / 15.74in, 450mm / 17.71in, 500mm / 19.68in 1This linear rail guide is made from quality bearing steel material, which has high hardness and durability. 2With professional and premium guide rail and stopper, this linear rail guide is sturdy and durable. 3The linear rail guide ensures high accuracy and stable performance, small and lightweight, suitable for most automation equipment. 4Equipped with two rubber stoppers on each side of the linear rail, it can prevent the carriage block from falling out 5This linear rail guide is suitable for Ender3/Corexy/Delta Kossel 3D printer upgrade and CNC machine.1 x_x000D_ _x000D_ Linear Rail Guide