Heat treated tool steel countersink with a HSS drill.
Adjustable for different length screws and can produce a counterbored hole for woodplugs.
The drill produces pilot holes only.
Dimensions:
D=3/8 inch
D=9.5 mm
D2=5/64 inch
D2=2 mm
Shank Diameter=1/4 inch hex
Screw size
Softwood=n/a
Hardwood=No.4
Shank Diameter: 1/4 hex
Diameter Imperial: 3/8
Diameter Metric: 9.5
Diameter 2 Metric: 2