Five precision linear bearings for CNC routers. Includes SBR10UU, SBR12UU, SBR16UU, SBR10LUU, and SBR12LUU. Bore sizes are 10, 12, and 16 mm to fit common shafts and rails. Pair with SBR20LUU linear guide rails for smooth X, Y, or Z axis movement. Key benefits - Smooth, accurate motion with low friction for repeatable cuts - Durable construction designed for demanding CNC use - Standard 10, 12 and 16 mm bores for easy replacement and broad compatibility - Easy maintenance and straightforward replacement What it delivers - Improves rigidity and reduces play on the router gantry - Supports precise milling, engraving, and routing on wood, plastics, and light aluminum - Enables modular builds or upgrades to existing machines Use scenarios - Upgrading a DIY CNC router gantry to achieve cleaner pockets and finishes - Replacing worn bearings on X and Y axes to restore accuracy - Building a compact, high precision CNC mill or engraver with reliable linear guidance Notes - Compatible with SBR20LUU rails for full axis guidance