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Check the listing for details. CMM Touch Probe Stylus 6mm Ruby Ball Tips 150mm Long M4 Ceramic Stem A-5000-8156. Condition: New. Listed at 78.19 USD. Cmm Probe Tip CMM Touch Probe Stylus 6mm Ruby Ball Ceramic Shaft M4. M4 Thread shank stylus Ø6 mm ruby ball, ceramic stem, Length 150 mm. Size: M4 D6 L150. It is one of the hardest materials available and suitable for most applications.