This precision ruby ball is ideal for applications requiring ultra-smooth motion. Measuring just 4mm in diameter, its ruby construction provides corrosion resistance and durability, lasting for years in even the most demanding industrial environments. The tight 50mm length-to-diameter ratio helps minimize wobble for accurate positioning. Ruby's hardness of 9 on the Mohs scale also makes this ball resistant to scratches and damage. Whether used in coordinate measuring machines, 3D scanners, or medical devices, its smooth rolling ability driven by minimal friction enables precise adjustments down to the micrometer. Renishaw's stringent quality control ensures each ball meets their high standards for roundness and dimensional consistency. An excellent choice for any application where reliable, long-lasting performance is as important as micron-level accuracy.