Starrett 648-4 - Depth Gage Base with Collet (4in)
The Starrett 648 Depth Gage Bases with 25SC38 Stem Collet to fit 3/8in (9.5mm) stem dia. (as per AGD). Split bushings for adapting stem diameter are available (sold separately) but not included.
Note: 648 Depth Gage base can accommodate 644 Dial Depth Gage
| Model | Length |
| 648-1R | 1in (Round Base) |
| 648-4 | 4in (Standard Base) |
| 648-6 | 6in (Standard Base) |
| 648-8 | 8in (Standard Base) |