Item Descriptions:-[Type]: This is a SCS20UU linear motion ball bearings, fits for 20mm round shaft.-[Application]: Fits for 3D printer and CNC machine or in variety of other linear applications.-[Precision Manufacturing]: The high-density aluminum alloy structure makes the slider a strong load-bearing capacity, and surface oxidation treatment, durable and corrosion-resistant.-[High Performance]: Smooth movement, low friction, high rigidity, easy to maintain and replace.-[Replacement]: Ideal for you to replace the damaged bearings in your equipment to improve efficiency and save energy.-[Package]: 4Pcs SCS20UU linear motion ball bearings, the length of each one is about 50mm.Package:4 x SCS20UU Linear Motion Ball Bearings(Note: Other accessories are not include.)Item Specifications:Type:Linear Rail Guide SlideModel:SCS20UUInner Diameter:20mm/0.78InchLength:50mm/1.96InchMaterial:Aluminum AlloyColor:SilverMPN:[AUTO FILL EAN]