M3 stylus with 1.0 mm diameter ruby ball, stepped carbide stem, and 4.0 mm diameter x 9.0 mm long stainless steel base. Major stem diameter is 1.0 mm, minor diameter is 0.8 mm. Overall stylus length is 53.0 mm. Stylus weight is 1.12 grams. Compare to Zeiss 626113-0100-053.