This is the M4 stylus extension #A-5000-7754. Extensions can be used when measuring very deep features and bores or probing points that are difficult to access. The ceramic stem is lightweight yet very hardwearing.
| Thread mount | M4 |
| Length (LE) | 30.0 mm |
| Stem Diameter (DGE) | 7.4 mm |
| Stem material | Ceramic |
| Mass | 5.1 g |
