63mm Drill bit to suit all of the 70mm & 90 weather instruments.
Also suits the 108mm white TFA instruments.
These are available in both HSS and Tungsten Options.
Length of shaft-130mm ( shaft only )
Diameter of Shaft- 18mm
Diameter where it fits into drill - 12mm
Overall Length 160mm
To cut 63mm Hole
HSS is great for hobby and occassional use,
The Tungsten is designed to last longer and is good for more difficult to cut timbers.