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M3 stylus with 0.5 mm diameter ruby ball, tapered carbide stem, and 4.0 mm diameter x 10.0 mm long stainless steel base. Major stem diameter is 1.0 mm; minor diameter is 0.3 mm. Overall stylus length is 21.25 mm. Stylus weight is 0.89 gram. Compare to Zeiss 602030-8115-000.