M2 stylus with 2.0 mm diameter ruby ball, 1.0 mm diameter carbide stem, and 3.0 mm diameter x 6.0 mm long stainless steel base. Stylus length to ball center is 20.0 mm. Stylus weight is 0.43 gram. Compare to Renishaw A-5003-3822, Zeiss 602030-8005-000, and Mitutoyo K651251.