Wood Countersink Replacement Bits Feature:

• Tapered drill with widened flutes for drilling fast, clean pilot holes.
• Adjustable four-cutter counterbore cuts and clears chips quicker for fast, smooth countersinking.
• Counterbore attaches to flats on shank with two hex screws for a secure fit, and can be adjusted for controlled pilot hole depth.
• 1/4" quick-change shank reduces slipping in standard chucks and is compatible with all 1/4" quick-change chucks, including impact drills.