Eowpower 6Pcs Aluminum SHF8 Size 8mm Linear Rod Rail Shaft Support Motion Go to amazon.com Related posts Top 6 best 8mm rod support 2022 FeatureSHF8 Linear Rail SupportMaterial:Aluminum AlloyInside Diameter:8mm/0.315"Surface Treatment:Sand blasting, oxidationPackage Includes:6Pcs DescriptionInside Diameter:8mm/0.315"