Two pieces of shaft rail linear rail designed for use as axis components in 3D printers and other motion projects. These cylinder rods provide a smooth, straight run for linear movement and can be used to worn rails or to build axis assemblies. Key benefits Enables smooth, straight linear motion for reliable axis operation. Dualrail package provides balanced support for stable movement. Simple replacement option for existing 3D printer rails and related axis components. Compact, cylindrical rod form suitable for integration into compact GANTRY or X/Y/Z axes. Key attributes Package quantity: 2 pieces Type: Shaft rail linear rail, cylinder rods, axis linear round rod Size options listed in product title: L 100 200 300 400 800(10mm,600mm) 600mm 10mm Application: 3D printer parts; axis linear round rod Compatibility hints: designed for 10 mm diameter round rods and standard 10 mm bearing interfaces (as implied by diameter spec) Use cases and applications or upgrade the X, Y, or Z axis rails on a 3D printer to improve stability and motion quality. Provide smooth linear guidance for a DIY CNC machine or laser cutter gantry. Fit into custom robotics or motion projects that require precise, straight roundrod guidance with a 10 mm diameter. Notes The description references multiple length options and a 10 mm diameter, as shown in the product title. The listed sizes are L 100 200 300 400 800(10mm,600mm) 600mm 10mm. Use the appropriate length to match your build requirements.