M3 stylus with 0.8 mm diameter ruby ball, tapered carbide stem, and 4.0 mm diameter x 13.0 mm long stainless steel base. Minor stem diameter is 0.6 mm; major diameter is 1.0 mm. Overall stylus length is 22.0 mm. Stylus weight is 0.91 gram. Compare to Zeiss 602030-8117-000, Mitutoyo K651103, and Renishaw A-5555-0269.