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Features: Quite smooth surface, resistant to rust and corrosion. Made of high quality bearing steel, the linear rod are durable and sturdy. Shaft diameter and length specified for accurate fit. Suitable for 3D printer Reprap X Y Z axis, CNC, etc. Extensive applications, especially in bearing purpose. Specifications: Color: Silver Size: 6mm x 500mm Material: High Quality Carbon Steel (C45#) Hardness: 55-60 HRC Surface Hard-thickness: 0.8 – 2.5mm Surface roughness: 0.8S – 1.6S Straightness: Below 5μm/100mm Surface Chrome thickness: 10um-20um Surface Finish Quality: Ra 0.8 Package Included: 2 * Linear Rail Shaft(6mmx500mm)