2-Piece Linear Motion Rods: This set includes two 20 mm diameter, 1200 mm long linear rail shafts. The high-compatibility design pairs seamlessly with various linear rails and machinery, ensuring smooth and stable motion for industrial applications Hardened Carbon Steel Shaft: Crafted from carbon steel with a hardness of HRC5866, the linear guide rail shaft delivers exceptional strength and resists bending under heavy-duty use, maintaining consistent accuracy in automation and mechanical systems Rust & Corrosion Protection: The linear motion rod shaft surface is coated with a 10 m electroplated layer to resist corrosion and rust, making it suitable for long-term use even in damp environments like basements High-Precision Linear Motion: Manufactured using a six-step grinding process, the guide rail shaft achieves a 0.10