Features: Made of high-quality materials for durability 50mm CMM Touch Probe Stylus 6mm Diameter Ru by Ball Ceramic Rod M4 CMM A-5000-3709. / 100mm CMM Touch Probe Stylus 6mm Diameter Ru by Ball Ceramic Rod M4 CMM A-5000-3712. CMM probe tip ball ceramic shaft threaded shank M4. Easy to use.has a long service life and does not wear the surface from abrasive materials. Product parameters: Model: A-5000-3709 / A-5000-3712 Threaded handle: M4 Ball diameter: Ø6mm Ceramic stem: Ø4.5mm Please note; the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Material: Metal+ceramic colour: As Shown Package Contents: 2 x Contact probe Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.