M5 stylus with 0.25 mm ruby ball, tapered carbide stem, and 11.0 mm diameter x 9.0 mm long stainless steel base. Minor stem diameter is 0.2 mm, major diameter is 1.0 mm. Overall stylus length is 21.8 mm. Stylus weight is 5.66 grams. Compare to Zeiss 626115-0021-022.