- 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.

- 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: High Speed Steel Drill 4241

- Black chamfer drill body material: steel 45

-Size:

5# ：1.98 mm (0.07795 inches) x 50 mm (length)

6#: 2.38 mm (0.0937 inch) x 55 mm (length)

8# ：2.78 mm (0.1094 inch) x 60 mm (length)

10#: 3.175 mm (0.125 inch) x 63 mm (length)

12#: 3.56 mm (0.14 inch) x 65 mm (length)

Shank diameter: 1/4 hexagonal handle

-Package included:(For use in wood and plastic)

5 x Drill Bits

1 x Hex Shank

6PCS Screw Countersink Bit Set Pilot Holre Drill Metal Plastic Wood Hex Shank AU