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Specification: 100% Brand New and High Quality Model: SC12UU Shaft ID:12mm Shaft OD:21mm Quantity: 2pcs Weight:191g Aluminum ball bearing box sliding unit with sealed ball bearings, easy to install by bolt on a working platform, and to move through the design of compact Aluminum, SBR, TBR series linear guide side railalternatives, low cost, for linear motion precision is not very high occasions. Ball in the cage loop to run a smooth ball guide surface to ensure even if high-speed operation, low noise. Package Included: 2 x SC12UU Ball Bearing Slide Bushing