Feature：

Four piece set includes bits for drilling pilot holes for screw sizes 6#，8#，10# and 12#.
Special designed steel counter sleeve countersinks or counter bores pilot hole.
Adjustable counter sleeve depth with Allen wrench.
Standard hex shank is quick change compatible.
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.
Pre-drill and countersink to drive screws flush with the material surface or deep hole counter boring for driving screw heads below the surface.
Ultra-sharp cutting flute clears chips efficiently and leaves a clean， smooth hole.
Adjustable drill bit length for desired screwed depth， and features a flattened shank for a no-slip countersink connection.
Countersink or counter bore clean， smooth holes for screws and fasteners
Power groove 1/4" hex shank is quick change and impact drill/driver compatible
Allen wrench for drill bit depth adjustment and pilot bit replacement
For use in wood and plastic

Package include:

4 x Countersink Drill Bits
1 x Hex Shank

specifications	The diameter of 0	The diameter of 1	The diameter of 2	The diameter of 3	The diameter of 3
6#	2.3mm	4.62mm	7mm	10mm	49.4mm
8#	2.7mm	5.09mm	8.06mm	10mm	60.31mm
10#	3.15mm	5.09mm	8.06mm	10mm	62.6mm
12#	3.48mm	6mm	9.89mm	10mm	70.3mm