M3 stylus with 0.6 mm diameter ruby ball, stepped carbide stem, and 4.0 mm diameter x 13.0 mm long stainless steel base. Minor stem diameter is 0.4 mm, major diameter is 1.0 mm. Overall stylus length is 22.0 mm. Stylus weight is 0.90 gram. Compare to Zeiss 602030-8116-000.