untersink Drill bit Set, 3-in-1 Woodworking Countersink Counterbore Drill Bits
Specifications:
For Drilling #4 #6 #8 #10 #12 Screw Holes
With Adjustable Depth Stop
6mm Quick Release Hex Shank,
Sizes: 2 mm, 2.5mm, 2.5mm,3.2mm, 3.5 mm
Include：2 Allen Wrenches
Functions：
To have the head of the screw below the surface then conceal it with matching wood plugs
To have the head of the screw fit flush with the surface
Compatibility:
The high quality M2 pilot drill bits are precisely ground. It is detachable. You can move it up and down in the countersink/counterbore sleeve to adjust drill depth to meet multi screw lengths.
The cutting angle of the 3 countersink chamfer cutters is 82 degrees, perfect for popular screw heads.
The counterbore is 10mm in diameter, 12mm in full depth. They will meet your needs from flush countersinking to a full 1/2″ of counterbore for dowel buttons or plugs.
Reference Chart：
1-piece of Size 2 mm for #4 Screw
1-piece of Size 2.5 mm for #6 Screw
1-piece of Size 2.8 mm for #8 Screw
2-piece of Size 3.2 mm for #10 Screw
2-piece of Size 3.5 mm for #12 Screw
For softwood, we recommend you to use a drill one size smaller than the screw calls for.