M2 star stylus with five 2.0 mm diameter ruby balls. Fully adjustable. 18.0 mm between ball centers. Center stylus measures 16.5 mm from base to ball center. Stems are stainless steel, 1.4 mm diameter. Assembled weight is 1.27 grams. Compare to Zeiss 602030-8010-000, Renishaw A-5000-7629, and Mitutoyo K650451.