The IRWIN Wood Countersink Set is perfects for creating variable-sized countersink holes quickly. With tapered drills and widened flutes, these bits have adjustable four-cutter counterbores that attach to flats on the shank to clear chips quickly and can be adjusted to control the pilot hole depth. This set includes #4, #6, #8, #10, #12, #14, countersinks and Depth Stop (2).

• 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.