Irwin 1882630 Wood Countersink Drill Bit, #4 x 7/64"

1/4" quick change shank reduces slipping in standard chucks and is compatible with all 1/4" quick change chucks, including impact drills. Counter bore attaches to flats on shank with two hex screws for a secure fit and can be adjusted for controlled pilot hole depth.

Highlights:

• Tapered drill with widened flutes for drilling fast, clean pilot holes
• Adjustable four-cutter counterbore cuts and clears chips quicker for fast, smooth countersinking

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