<h3>Key features</h3><ul> <li>COMPLETE LINEAR RAIL : Two 600 mm/23.6 long SBR20 rail shafts, and 4 SBR20UU blocks are included in the package. Smooth sliding blocks moving freely and fastly</li> <li>PERFECT SLIDEING SYSTEM: With industrial-grade standard SBR block and a high precision linear bearing inside, the original rail set can be stabilized by rail axle bearing rail and aluminum alloy support</li> <li>HIGH QUALITY MATERIAL: The linear rail made of good quality steel and aluminum alloy Surface chrome plating treatment to be anti-rust, high hardness and more durable</li> <li>EFFORTLESS TO INSTALL: Aluminum alloy support rail with pre-drilled holes for ease of mounting. Stainless steel Linear optical axis guide bearings linear movement. Easy to install, no need for maintenance. 4 pieces SBR20UU Bearing Blocks afforded</li> <li>VARIOUS USES: The linear rails apply for large-scale transmission equipment including industrial robots, cracker machines, supersonic cleaning equipments, solar energy and clothing supporting devices, etc</li> </ul><p>Free shipping included. 30-day hassle-free returns.</p>