This is the disk styli #A-5000-4187.
Disc styli are designed to inspect undercuts and grooves within bores which may be inaccessible to star styli. A range of disc styli offers a radius end roller to enable groove width measurement. Silver steel tips are heat treated and precision ground to a high tolerance.
| Thread mount (DG) | M2 |
| Disk Depth (B) | 3.1 mm |
| Roller Depth (L) | N/A |
| Stem diameter (DS) | N/A |
| Disk diameter (DK) | 25.0 mm |
| Disk material | Silver Steel |
| Stem material | Stainless Steel |
| Mass | 3.8 g |
