<h3>Key features</h3><ul> <li>PREMIER SBR12 KIT-This linear rail set includes 2pcs of 800mm(31.49inch) long sbr12 fully Supported rail shafts and 4pcs Industry-standard sbr12uu bearing slide block.</li> <li>HIGH-QUALITY- Linear rails kit are made of carbon steel and aluminum alloy, surface chrome plating treatment beautiful anti-rust, high hardness, more durable.</li> <li>EASY TO INSTALL-Aluminum support rail with pre-drilled holes for ease of mounting. Suits X, Y, Z axis.</li> <li>HIGH PRECISION- No stick-slip effect, less heating, reduced drive power required. Low friction loss, high transmission efficiency.</li> <li>APPLICATIONS: This Linear Guide Rail can help build an linear motion system. Widely used for DIY CNC routers, grinding machine, lathes, mills, machine tools, laser welding machines, punch, automatic cutting machine, printer, X-Y table, etc.</li> </ul><p>Free shipping included. 30-day hassle-free returns.</p>