This is the M5 styli for thread measurement #A-5555-0075. It has a stainless steel base, tungsten carbide stem, and ruby ball.
| Thread mount | M5 |
| Ball diameter (DK) | 2.3 mm |
| Overall length (L) | 40.0 mm |
| EWL (ML) | 12.0 mm |
| Stem diameter (DS) | 1.0 mm |
| Stem length (B) | 2.5 mm |
| Base diameter (DG) | 11.0 mm |
| Ball Material | Ruby |
| Stem Material | Tungsten Carbide |
| Mass | 13.0 g |
