6 piece set includes 5 bits for drilling pilot holes for screw sizes #6 #8 #10 #12 #14 and 1 hex wrench.
Special designed HSS steel counter sleeve countersinks & counter bores pilot hole.
Adjustable counter sleeve depth with allen wrench.
Adjustable drills length for various length screws simply by loosening and tightening the screw.
Pre-drilling and countersink to drive screws flush with the material surface or deep hole counter boring for driving screw heads below the surface.
Super 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.