Mssoomm Linear Motion Rod Shaft Guide D 20mm x L 12.6 inch / 320mm Case Hardened Chrome Plated for 3D Printer, DIY, CNC - Metric h8 Tolerance, 2Pcs

Description Specifications: Brand: MssoommMaterial: High Quality Carbon Steel (C45)Hardness: 58-64 HRCSurface Hard-thickness: 0.8 – 2.5mmSurface Roughness: 0.8S – 1.6SStraightness: Below 5μm/100mmSurface Chrome Thickness: 15um-20umSurface Finish Quality: Ra 0.8Color: SilverThis item includes:2pcs 20mm x 320mm Linear Rail Shaft Rod