M2 Ø2 mm ruby ball, tungsten carbide stem, L 20 mm, EWL 14 mm Ball diameter (mm)2 Centre styli false EWL (mm) 14 Holder material Stainless steel Overall length (mm) 20 Stem diameter (mm) 1 Stem material Tungsten carbide Thread M2 Tip material Ruby CAL1 B1 JIS B 0601:1994
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