This is the M4 disc stylus #A-5000-7598.
Disc styli are designed to inspect undercuts and grooves within bores which may be in accessible to star styli. A range of disc styli offers a ‘radius end roller’ to enable groove width measurement.
| Diameter (A) | 50 mm |
| Diameter (G) | 23.0 mm |
| Width (B) | 3.0 mm |
| C | 4.0 mm |
| F | 10.0 mm |
| E | 10.0 mm |
| Mass | 13.55 g |
| Disk material | Silver Steel |
