This set provides four SC20UU or SCS20UU 20mm linear ball bearing blocks designed for smooth, precise linear motion in router and CNC applications. It also includes a LM20UU bush pillow block with a 20mm shaft, forming a complete linear motion package for axis and gantry builds. Key benefits Smooth, lowfriction motion on a 20mm shaft for accurate positioning and repeatability. Rugged, reliable block design suitable for routing, milling, and automated equipment. Readytoassemble package that supports quick setup of XY, Z, or gantry configurations. Compatible with standard 20mm linear shafts and LM20UU pillow block systems, enabling versatile integration. Four blocks per lot provide scalable options for multiaxis deployments and stable axis guidance. Key attributes Configuration: 4 pieces of SC20UU or SCS20UU 20mm linear ball bearing blocks plus LM20UU bush pillow block with a 20mm shaft. Shaft diameter: 20 mm Block type: Linear ball bearing blocks (SC20UU / SCS20UU) Compatibility: Designed for 20mm linear shafts and LM20UU pillow block systems Size: 20mm shaft compatibility; suitable for compact to midsize motion assemblies Performance: Provides smooth travel, stable guidance, and reliable load support in routine motion tasks Material: Not specified in listing; designed to meet standard 20mm linear motion block specifications Applications and use cases CNC router gantry or axes: Build or retrofit router axes with precise, repeatable motion for cutting and engraving. 3D printers and laser cutters: Implement reliable X/Y axis guidance with smooth, consistent motion and reduced play. Automation fixtures and machining setups: Create linear slides and transfer stages for packaging, inspection, or light milling tasks. Notes Suitable for installations requiring standard 20mm shaft systems. Regular lubrication and clean mounting surfaces help maintain performance. Ensure proper alignment and secure mounting to maximize precision and load distribution.