Use for OMP40-2 OMP60 RMP60 RMP600 Material quality：Ruby Ball Ceramic Rod Thread: M4， length：50mm(1.97in) Spherical diameter：6mm(0.24in) Replaceable：HEXAGON H00027390, 91.00-T53/6-KE-M4 Durable and long-lasting: Made of high-quality materials that ensure durability and longevity. Accurate measurements: Equipped with a 50mm Stylus with a 6mm diameter Ruby Ball Ceramic Rod and M4 A-5000-3709, providing precise and reliable measurements. Versatile: The probe tip ball ceramic shaft threaded shank M4 is compatible with a wide range of machines and applications. User-friendly: Easy to use, making it accessible to both professionals and beginners. Resistant to wear and tear: The Ruby Ball Ceramic Rod has a long service life and does not wear the surface from abrasive materials, ensuring consistent performance over time.