This is the M3 disk an hollow ball styli #A-5000-7669.
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.
| Thread mount (DG) | M3 |
| Disk Depth (B) | 6.0 mm |
| Roller Depth (L) | N/A |
| Stem diameter (DS) | N/A |
| Disk diameter (DK) | 63.5 mm |
| Disk material | Carbon Steel |
| Stem material | Stainless Steel |
| Mass | 45.0 g |
