This FAMAG 1639 extension shank accepts all 10mm shaft FAMAG drill bits including FAMAG Bormax Forstners 22mm and up.
2.5mm Allen key required, not supplied.
| part number | inner diameter (mm) | outer diameter (mm) | shaft diameter (mm) | overall length (mm) |
| 1639.001 | 10 | 16 | 10 | 125 |
| 1639.002 | 10 | 16 | 10 | 250 |
| 1639.003 | 8 | 16 | 10 | 125 |
| 1639.004 | 8 | 16 | 10 | 250 |
