This is the M3 tungsten carbide styli for Zeiss #A-5555-0265. It has a stainless steel base, tungsten carbide stem and ruby ball.
| Styli | M3 |
| Ball Diameter (DK) | 4.0 mm |
| Length (L) | 33.0 mm |
| Base Diameter (DG) | 4.0 mm |
| EWL (ML) | 23.0 mm |
| Stem Diameter (DS) | 2.5 mm |
| Stem material | Tungsten Carbide |
| Mass | 2.5 g |
