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★ Countersink Drill Bits Set Made of HSS 4241with Titanium-coated, high toughness, wear resistance, and good cutting edge retention, including 6/8/10/12/14# diameter.
★ Special designed HSS steel counter sleeve countersinks or counter bores pilot hole. Adjustable counter sleeve depth with a 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. Countersinks drill bit is suitable for wooden board, plastic board and other low hardness board, but not steel board.