alloy tool steel, 7-edged, with apex angle 90 °, unequal division head with vollgeschliffenem tool head (Krauskopf), lowering of holes in all types of wood, veneered, laminated board and many plastics, chatter-lowering possible in softwood
| ø | 25 mm |
| Total length | 90 mm |
| Effective length | 60 mm |
| Shaft | 8 mm |