Five piece set includes bits for drilling pilot holes for screw sizes#5 #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.

Specifications
Color:natural color
Black chamfer drill body material: steel 45

specifications	The diameter of 0	The diameter of 1	The diameter of 2	The diameter of 3	Total length
5#	1.87mm	4.66mm	7.2mm	10mm	49.63mm
6#	2.33mm	4.25mm	7.38mm	10mm	56.57mm
8#	2.74mm	4.8mm	8.12mm	10mm	68.67mm
10#	2.81mm	5.17mm	8.18mm	10mm	68.84mm
12#	3.53mm	6.21mm	9.89mm	10mm	70.5mm

Package include
5 x Countersink Drill Bits
1 x Hex Shank