Use for OMP40-2 OMP60 RMP60 RMP600 probe Material quality： Ruby ball Tungsten carbide Rod Thread: M4 Spherical diameter：3mm(0.08i)n length：50mm(1.97in) Durable and long-lasting: Made of high-quality materials that ensure durability and longevity. Accurate measurements: Equipped with a 50mm Stylus with a 2mm diameter Ruby Ball tungsten carbide Rod and M4 A-5003-4797, providing precise and reliable measurements. Versatile: The probe tip ball tungsten carbide Rod 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 tungsten carbide Rod has a long service life and does not wear the surface from abrasive materials, ensuring consistent performance over time.