M5 stylus with 0.3 mm diameter ruby ball, tapered carbide stem, and 11.0 mm diameter x 10.0 mm long stainless steel base. Minor stem diameter is 0.2 mm, major diameter is 0.20 mm. Overall stylus length is 21.80 mm. Stylus weight is 5.50 grams. Compare to Zeiss 626115-0030-022 and Renishaw A-5555-0331.