<h3>Key features</h3><ul> <li>This Slide Bearing Block is fit for SBR12 12mm Linear Guide Rail, 4 Pcs</li> <li>Industrial-grade standard SBR block with high precision; With excellent motion ball, it moves smoothly with low friction. You can use it for a long time.</li> <li>The bearing block is made of aluminum alloy, sturdy and durable</li> <li>Standardized processing, ideal for guide rail positioning</li> <li>Perfect replacement for CNC router linear rails, mills, lathes and so on</li> </ul><p>Specifications: Brand: MssoommModel: SBR12The built-in material: Bearing SteelThe external material: Aluminum AlloyShaft Diameter/ Bore Size: 12mmThis item includes:4pcs SBR12UU Bearing BlocksFeature &amp; Application:- Working with SBR series linear rails.- Sliding blocks to be used cooperatively with rails, smooth sliding provided by inside linear bearing.- The linear rail apply for various kinds of automated machines and equipment, can help build economical cnc linear guiding system. - Applicable for large-scale transmission equipment including industrial robots, cleaning equipment and supporting devices, etc.</p><p>Free shipping included. 30-day hassle-free returns.</p>