2X SBR12/16/20/25 Linear Rail 200mm~4000mm+4X SBR12/16/20/25UU Bearing Block
Bearing Blocks: 4 PCS SBR12/16/20/25UU. 2 PCS SBR12/16/20/25+ 4 PCS SBR12/16/20/25UU. Sliding blocks to be used cooperatively with rails, smooth sliding provided by inside linear bearing. Type: Linear Slide Rail Set.