Name: 1/4 Hex Shank taper hole countersink drill woodworking countersunk head drill screw reaming.
Handle: 1/4 hexagonal handle.
Material: High-speed steel 4241 (for parts with hardness below 25HRC, such as carbon steel, thin iron plate, insulation board, PVC board, wood board, etc.). Black chamfer material is 45 steel

Specification:
Chamfer corresponds to bit size
6 # 2.38mm
8 # 2.78mm
10 # 3.175mm
12 # 3.56mm

Hexagon shank diameter of 6.35mm
Role: Can simultaneously drill out the screw hole and sink the counterbore of the screw cap and keep both in the same axis. After screwing, the screw cap is below the plane of the board!

Suitable for drilling machines with collets or fittings suitable for drilling holes in hard wood and timber