M5 stylus with 1.0 mm diameter ruby ball, tapered carbide shaft with 0.8 mm minor diameter, 1.0 mm major diameter, and 11.0 mm diameter x 9.0 mm long stainless steel base. Designed for use with slotted disks and clamping disks. Can be mounted directly to an M5 extension. Overall stylus length is 22.5 mm. Stylus weight is 5.74 grams. Compare to Zeiss 600342-8254-000.