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 | outer diameter | shaft diameter | overall length |
| 1639.001 | 10mm | 16mm | 10mm | 125mm |
| 1639.002 | 10mm | 16mm | 10mm | 250mm |
| 1639.003 | 8mm | 16mm | 10mm | 125mm |
| 1639.004 | 8mm | 16mm | 10mm | 250mm |
