Ideal for drilling, countersinking and counterboring in one operation.
This means that a No.8 Screwdigger can be adjusted to predrill for different lengths of No. 8 Screw.
Uses 7/64in Drill Bit.
To ensure an acurate fit we suggest you use the same Plug Cutter from the Disston brand.
For No 8 screw
Irwin Auger Drill Bit Extension 450mm 26-40mm
The Irwin IRW10502744 Auger drill bit has the following dimensions:
Drillbit diameter: 10.0mm
Total length: 191mm
Working Length: 114mm
The Irwin IRW10502779 Auger bit - long series has the following dimensions:
Drillbit diameter: 28.0mm
Total length: 400mm
Working Length: 323mm
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