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63mm Drill bit to suit all of the 70mm & 90 weather instruments.
Also suits the 108mm white TFA instruments.
Tungsten Drill Bit
Length of shaft- 75mm ( Shaft only)
Diameter of Shaft- 18mm
Diameter where it fits into drill - 10mm
Overall Length - 90mm
Tungsten -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.
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