Screw Countersink Drill Bit Pilot Holre Plastic Wood Hex Shank Drill Bit Tool AU

Special designed steel counter sleeve countersinks or counter bores pilot hole.
Adjustable counter sleeve depth with a wrench.
Drill and countersink for wood screws without changing bits.
Drilling length can be adjusted for various length screws simply by loosening and tightening
the setscrew.
Countersink or counter bore clean, smooth holes for screws and fasteners
For use in wood and plastic
4 Pcs set includes bits for drilling pilot holes for screw sizes #6,#8,#10,#12.
It can drill the screw holes and keep on the same axis,after screw in screw，nut below the board!
Apply to with a clamp or joint drilling machine, suitable for drilling in the hard wood and wood floor, machine screw for wood screw.
Material: HSS Drill 4241
Black chamfer drill body material: steel 45
Model the corresponding bit size:#6 2.38mm/#8 2.78mm/#10 3.175mm/#12 3.56mm
Shank:6.35mm dia hex shank

What's Included ?

4 x Drill Bits
1 x Hex Shank