8 Pack Woodworking Countersink Drill Bits Set 3in1, Heavy Duty 6542 Pilot Drill Bits Depth Adjustable, 82-Degree Chamfer, 6mm Hex Shank, for

8-pack Woodworking Countersink Counterbore Drill Bits Set 3in1
They are to save you time and money. Choose a proper sized bit, you can drill, countersink and counterbore in one step, and get clean countersinks and counterbores for #4 #6 #8 #10 #12 #14 Screws in quick fashion.
Built with 6mm hex shanks for quick in-and-out change bit connection, compatible with any hex-chuck drill or driver.
The pilot drill bit working length is adjustable, so you can have precise depth control for screws.
Use a hex wrench to change depth and tight the drill bit in each countersink
There are 3 sharp edges in each countersink in 82-degree chamfer for clean holes to set screws flush with or below the surface of a material
Specifications:
Material: High-speed steel
Size：2mm, 2.5mm, 2.8mm, 3.2mm(x2), 3.5mm(x2), 4mm
For #4 #6 #8 #10 #12 #14 Screws
Extra pilot bits included