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M2 stylus with 2.5 mm diameter ruby ball and stainless steel stem and base. Stem diameter is 1.4 mm. Base diameter is 3.0 mm. Stylus length to ball center is 20.0 mm. Stylus weight is 0.47 gram. Compare to Renishaw A-5000-7804 and Zeiss 000000-1776-477.