Specification Brand : VICHSAMWY BulletPoint1 : HIGH FINISH AND STRAIGHTNESS:The surface of the Linear Motion Rods is treated by special grinding and hard chrome plating technology, and then mirror polished. The surface is smooth, without cracks, and even with no bubbles. BulletPoint2 : HIGH HARDNESS: Adapting C45 high quality steel, high frequency quenching, surface chromium plating(10um-20um). The case hardness could be reach to 57-62 HRC. Durable and corrosion-resistant. BulletPoint3 : HIGH ACCURACY: Diameter 8mm, tolerance -0.005mm to -0.03mm ( 7.995mm - 7.97mm), length 350mm, tolerance ± 0.5mm ( 349.5mm - 350.5mm ). BulletPoint4 : HUMANIZATION DESIGN:Chamfer on both ends, easier to install linear bearings and won't hurt fingers when installing it. BulletPoint5 : WHAT YOU GET: 2 PCS 8mm x 350mm Linear Motion Shaft. 30-Days money back guarantee, 1-Year warranty, 24/7 friendly customer service. ExternallyAssignedProductIdentifier1 : 784121752269 ExternallyAssignedProductIdentifier2 : 0784121752269 FinishType : Polished ItemName : Linear Motion Rods 2PCS 8mmx 350mm (0.315 x 13.78 inches) Case Hardened Chrome Plated Linear Motion Rod Shaft Guide for 3D Printer, DIY, CNC - Metric h8 Tolerance ItemPackageDimensions_Height : 37.1 centimeters ItemPackageDimensions_Length : 1.2 centimeters ItemPackageDimensions_Width : 15.6 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : linear-motion-guides Manufacturer : VI-CHAN Material : Carbon Steel ModelNumber : VC-LMR8 NumberOfItems : 2 PartNumber : VC-LMR8 ProductSiteLaunchDate : 2020-09-18T07:56:46.611Z Size : 350mm length Style : Diameter 8mm SupplierDeclaredDgHzRegulation : not_applicable UnspscCode : 24102000