This is the M2 spherical disk styli #A-5555-0297. It has stainless steel base, a tungsten carbide stem and a ceramic disk.
| Thread mount | M2 |
| Disk Diameter (d) | 8.0 mm |
| Length (L/Z) | 32.0 mm |
| EWL (ML) | 19.0 mm |
| Base Width (D) | 3.0 mm |
| Stem Diameter (ds) | 1.5 mm |
| Disk Width (B) | 1.5 mm |
| Stem Material | Tungsten Carbide |
| Mass | 1.0 g |
