<h3>Key features</h3><ul> <li>SCS12UU Sliding Block Diameter (dr) 12mm, Length 36mm, Aluminium Alloy Linear Ball Bearing Slide Block Units, Improve Efficiency and Save Energy in your Devices.</li> <li>SCS12UU Light-weight housing and Chromium Steel bearing ball, good abrasion resistance, high precision and good strength, smooth moving, low friction, high rigidity and long working life.</li> <li>The universal Ball Bearings is great for you to replace the damaged Ball Bearings in your devices to improve them efficiency and save energy.</li> <li>Linear bearing widely used in kinds of electronic equipment/guide bar, drive shaft, pillar, construction machinery, automotive components,pumps,and machinery.</li> <li>4Pcs Linear bearing sliding block in a pack, main application is working with linear rails.</li> </ul><p>Free shipping included. 30-day hassle-free returns.</p>