M5 stylus with 2.5 mm diameter ruby ball, 1.5 mm diameter carbide shaft, and 11.0 mm diameter x 9.0 mm long stainless steel base. Designed for use with slotted washers and clamping washers. Can be mounted directly to an M5 extension. Overall stylus length is 34.0 mm. Stylus weight is 6.12 grams. Compare to Zeiss 600342-8203-000.