<h3>Key features</h3><ul> <li>The bearing block is made of aluminum alloy, sturdy and durable</li> <li>Industrial-grade standard SBR block with high precision</li> <li>Aluminum alloy support rail with pre-drilled holes for ease of mounting</li> <li>Standardized processing, ideal for guide rail positioning</li> <li>Perfect for the DIY CNC routers, mills, lathes and so on</li> </ul><p>Specifications: Brand: MssoommModel: SBR12Shaft Diameter: 12mmThis item includes:2pcs SBR12UU Bearing BlocksFeature &amp; Application:Cylindrical guide composed by principal rail and aluminum support, stabilizing the original rail.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 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>