Features 1、WITHOUT WEAR: Ruby ball has a long service life and does not wear the surface of abrasive materials, stable and durable 2、GOOD STIFFNESS: For steel balls larger than 3mm in diameter and over 30mm in length, the stiffness of the ceramic rod is comparable to steel, but much lighter than tungsten carbide 3、PREVENT FROM CRASH: The ceramic rod style also provides additional crash protection for the probe as the rod can shatter in a crash 4、DIRECT ACCESS: Straight model is designed for inspection of simple features with direct, unobstructed access to the measurement surface 5、150MM LENGTH: Threaded shank with M4 contact pin and dia 6mm ruby ball, and ceramic step, the length is 150mm, possess excellent performance Specification Item Type: CMM Touch Probe Stylus Material: Stainless steel, ceramic Thread: M4 Application: Three coordinate machine tool stylus Specifications: A-5000-8156 Ruby Ball Diameter: Approx. 6mm / 0.24in Length: Approx. 150mm / 5.91in Package List 1 x CMM Touch Probe Stylus 1 x Storage Box