Use for OMP40-2 OMP60 RMP60 RMP600 probe Material quality：Ruby Ball Ceramic Rod Thread: M4 length：100mm(3.94in) Spherical diameter：6mm(0.24in) Can replaceable: H00027392 , 91.00-T103/6-KE-M4 Durable and long-lasting: Made of high-quality materials that ensure durability and longevity. Accurate measurements: Equipped with a 100mm（3.94in) Stylus with a 6mm（0.24in） diameter Ruby Ball Ceramic Rod and M4 A-5000-3712, 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.