This is the Walter M1.4 thread styli #A-5003-3814.
| Thread mount (DG) | M1.4 |
| Overall length (L) | 12.5 mm |
| EWL (ML) | 1.5 mm |
| Stem diameter (DS) | 0.36 mm |
| Ball diameter (DK) | 0.5 mm |
| Stem material | Tungsten carbide |
| Ball material | Tungsten carbide |
| Center styli | N |
| Mass | 0.2 g |
