This is the M5 styli with conical stem base for Zeiss #A-5555-0007. It has a titanium base, tungsten carbide stem, and a ruby ball.
| Overall length (L) | 100.00 mm |
| EWL (ML) | 60.0 mm |
| Ball Diameter (DK) | 5.00 mm |
| Cone Diameter (DG) | 19.00 mm |
| Stem diameter (DS) | 3.5 mm |
| Ball material | Ruby |
| Stem material | Tungsten carbide |
| Base material | Titanium |
| Mass | 38.00 g |
