2Pcs 12mm x 400mm (0.472 x 15.74 inches) Vigorous Linear Motion Rods, Case Hardened Chrome Shaft Linear Rail Guide Shaft for 3D Printer, DIY, CNC - Metric h8 Tolerance Sun Laboratories by Giesee Laneige sleeping masks

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2Pcs 12mm x 400mm (0.472 x 15.74 inches) Vigorous Linear Motion Rods, Case Hardened Chrome Shaft Linear Rail Guide Shaft for 3D Printer, DIY, CNC - Metric h8 Tolerance Sun Laboratories by Giesee Laneige sleeping masksWhat You Get: 2Pcs 12mm x 400mm Linear Motion Rod Pack Great Performance Material: 45# Carbon steel, Hardness about HRC55 62, Surface roughness about Ra0. 05 08, Straightness0. 1 1000mm, Chrome plated thickness about 0. 01mm Tolerance: Diameter tolerance about 0. 01to 0. 03mm, Length tolerance about 0. 1mm Humannized Design: Our linear motion guides are chamfered about C1. 0 45on both ends in order to ensure safety and easiness in assembling other