<h3>Key features</h3><ul> <li>Industrial-grade standard SBR block with high precision</li> <li>Light-weight housing and Chromium Steel bearing ball, good abrasion resistance, high precision and good strength.</li> <li>Aluminum alloy support rail with pre-drilled holes for ease of mounting.</li> <li>Smooth moving, low friction, high rigidity and long working life.</li> <li>Perfect for the DIY CNC routers, mills, lathes and so on</li> </ul><p>Feature: - 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.Specifications: Model: SBR25The built-in material: Bearing SteelThe external material: Aluminum AlloyShaft Diameter/ Bore Size: 25mmThis item includes: 1pcs SBR25UU Bearing Blocks</p><p>Free shipping included. 30-day hassle-free returns.</p>